{"product_id":"scr-diesel-catalyst-330mm","title":"SCR Diesel Catalyst 118mm","description":"\u003cstyle\u003e\n  .cat-faq-module {\n    max-width: 100%;\n    margin: 30px 0;\n    font-family: 'Segoe UI', Roboto, Arial, sans-serif;\n    background: #ffffff;\n    border-radius: 28px;\n    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);\n    border: 1px solid #edf2f7;\n    padding: 30px 32px 10px 32px;\n    box-sizing: border-box;\n  }\n  .cat-faq-module .module-header {\n    display: flex;\n    align-items: center;\n    gap: 14px;\n    padding-bottom: 18px;\n    border-bottom: 3px solid #f0f4fa;\n    margin-bottom: 20px;\n  }\n  .cat-faq-module .module-header h2 {\n    font-size: 28px;\n    font-weight: 700;\n    color: #0b1a33;\n    margin: 0;\n    letter-spacing: -0.3px;\n  }\n  .cat-faq-module .module-header .badge {\n    background: #0b1a33;\n    color: #fff;\n    font-size: 14px;\n    font-weight: 600;\n    padding: 2px 18px;\n    border-radius: 30px;\n    letter-spacing: 0.3px;\n  }\n  .cat-faq-module details {\n    display: block;\n    margin-bottom: 6px;\n    border-bottom: 1px solid #eef2f6;\n    padding: 8px 0;\n    transition: all 0.2s ease;\n  }\n  .cat-faq-module details:last-of-type {\n    border-bottom: none;\n  }\n  .cat-faq-module summary {\n    display: flex;\n    align-items: center;\n    cursor: pointer;\n    font-size: 17px;\n    font-weight: 600;\n    color: #0b1a33;\n    padding: 10px 4px 10px 0;\n    list-style: none;\n    position: relative;\n    user-select: none;\n    gap: 12px;\n  }\n  .cat-faq-module summary::-webkit-details-marker {\n    display: none;\n  }\n  .cat-faq-module summary::before {\n    content: \"▶\";\n    font-size: 14px;\n    color: #1a73e8;\n    transition: transform 0.25s ease;\n    display: inline-block;\n    width: 20px;\n    font-weight: 400;\n  }\n  .cat-faq-module details[open] \u003e summary::before {\n    transform: rotate(90deg);\n  }\n  .cat-faq-module summary .q-mark {\n    background: #eef5ff;\n    color: #1a73e8;\n    font-weight: 700;\n    font-size: 14px;\n    padding: 0 12px;\n    border-radius: 20px;\n    line-height: 26px;\n  }\n  .cat-faq-module .answer-wrap {\n    padding: 8px 20px 16px 36px;\n    color: #2c3e50;\n    font-size: 15.5px;\n    line-height: 1.75;\n  }\n  .cat-faq-module .answer-wrap p {\n    margin: 0 0 12px 0;\n  }\n  .cat-faq-module .answer-wrap p:last-child {\n    margin-bottom: 0;\n  }\n  .cat-faq-module .answer-wrap ul, \n  .cat-faq-module .answer-wrap ol {\n    padding-left: 22px;\n    margin: 6px 0 12px 0;\n  }\n  .cat-faq-module .answer-wrap li {\n    margin-bottom: 4px;\n  }\n  .cat-faq-module .answer-wrap strong {\n    color: #0b1a33;\n  }\n  .cat-faq-module .warning-box {\n    background: #f9fcff;\n    border-left: 5px solid #1a73e8;\n    padding: 14px 22px;\n    border-radius: 12px;\n    margin: 12px 0 4px 0;\n    font-size: 15px;\n  }\n  .cat-faq-module table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 14.5px;\n    margin: 12px 0;\n  }\n  .cat-faq-module table th,\n  .cat-faq-module table td {\n    border: 1px solid #dce1e9;\n    padding: 10px 8px;\n    text-align: left;\n    vertical-align: middle;\n  }\n  .cat-faq-module table th {\n    background: #f0f4fa;\n  }\n  .cat-faq-module .contact-item {\n    margin-bottom: 10px;\n    padding-left: 4px;\n  }\n  .cat-faq-module .contact-item strong {\n    display: inline-block;\n    min-width: 60px;\n  }\n  @media (max-width: 640px) {\n    .cat-faq-module { padding: 18px 16px 6px 16px; }\n    .cat-faq-module .module-header h2 { font-size: 22px; }\n    .cat-faq-module summary { font-size: 15px; }\n    .cat-faq-module .answer-wrap { padding: 6px 8px 12px 20px; font-size: 14.5px; }\n    .cat-faq-module table { font-size: 13px; }\n    .cat-faq-module table th, .cat-faq-module table td { padding: 6px 4px; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"cat-faq-module\"\u003e\n  \u003cdiv class=\"module-header\"\u003e\n    \u003ch2\u003e Product Description \u003c\/h2\u003e\n    \u003cspan class=\"badge\"\u003eClick to expand\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Q1 – 什么是柴油车SCR？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ1\u003c\/span\u003e What is a diesel SCR system?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003e\u003cstrong\u003eSCR (Selective Catalytic Reduction)\u003c\/strong\u003e is an advanced exhaust after‑treatment system used in diesel vehicles to reduce nitrogen oxide (NO\u003csub\u003ex\u003c\/sub\u003e) emissions. It works by injecting a urea‑based solution (AdBlue \/ DEF) into the exhaust stream, which decomposes into ammonia (NH₃). The NH₃ then reacts with NO\u003csub\u003ex\u003c\/sub\u003e over a catalyst to produce harmless nitrogen (N₂) and water (H₂O).\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eKey components of an SCR system:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUrea tank\u003c\/strong\u003e – stores the AdBlue\/DEF fluid.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUrea dosing module\u003c\/strong\u003e – injects the precise amount of urea into the exhaust.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSCR catalyst\u003c\/strong\u003e – the ceramic substrate (coated with vanadium, copper, or iron‑based zeolite) where the chemical reduction takes place.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNO\u003csub\u003ex\u003c\/sub\u003e sensors\u003c\/strong\u003e – placed upstream and downstream to monitor system performance.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTemperature sensors\u003c\/strong\u003e – ensure optimal operating conditions.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003eSCR systems are essential for meeting Euro 4, 5, 6, and beyond emission standards for heavy‑duty and light‑duty diesel engines.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q2 – SCR涂钒\/铜\/铁分子筛的区别？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ2\u003c\/span\u003e Difference between vanadium, copper‑zeolite, and iron‑zeolite SCR coatings?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eSCR catalysts are classified by the active metal used in the coating. The three main types are \u003cstrong\u003evanadium‑based\u003c\/strong\u003e, \u003cstrong\u003ecopper‑zeolite (Cu‑zeolite)\u003c\/strong\u003e, and \u003cstrong\u003eiron‑zeolite (Fe‑zeolite)\u003c\/strong\u003e. Each has distinct characteristics:\u003c\/p\u003e\n      \u003ctable\u003e\n        \u003cthead\u003e\n          \u003ctr\u003e\n            \u003cth\u003eProperty\u003c\/th\u003e\n            \u003cth\u003eVanadium‑based\u003c\/th\u003e\n            \u003cth\u003eCopper‑Zeolite (Cu)\u003c\/th\u003e\n            \u003cth\u003eIron‑Zeolite (Fe)\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eActive metal\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eVanadium pentoxide (V₂O₅)\u003c\/td\u003e\n            \u003ctd\u003eCopper (Cu) exchanged in zeolite\u003c\/td\u003e\n            \u003ctd\u003eIron (Fe) exchanged in zeolite\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eOperating temperature range\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e250°C – 450°C\u003c\/td\u003e\n            \u003ctd\u003e180°C – 500°C\u003c\/td\u003e\n            \u003ctd\u003e250°C – 600°C\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eLow‑temperature activity\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eModerate\u003c\/td\u003e\n            \u003ctd\u003eExcellent (active below 200°C)\u003c\/td\u003e\n            \u003ctd\u003eModerate\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eHigh‑temperature durability\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eLimited above 450°C\u003c\/td\u003e\n            \u003ctd\u003eGood up to 650°C\u003c\/td\u003e\n            \u003ctd\u003eExcellent up to 700°C\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eSulfur tolerance\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eGood\u003c\/td\u003e\n            \u003ctd\u003eModerate (sulfur‑sensitive)\u003c\/td\u003e\n            \u003ctd\u003eGood\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eHydrothermal ageing\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eSusceptible at high temp\u003c\/td\u003e\n            \u003ctd\u003eGood durability\u003c\/td\u003e\n            \u003ctd\u003eExcellent durability\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eCost\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eLow\u003c\/td\u003e\n            \u003ctd\u003eMedium\u003c\/td\u003e\n            \u003ctd\u003eMedium‑High\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eTypical application\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eOlder Euro 4\/5 systems\u003c\/td\u003e\n            \u003ctd\u003eEuro 6 light‑duty and heavy‑duty\u003c\/td\u003e\n            \u003ctd\u003eEuro 6 heavy‑duty, high‑load applications\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n      \u003cp\u003e\u003cstrong\u003eSelection guide:\u003c\/strong\u003e Cu‑zeolite is preferred for cold‑start and low‑load conditions; Fe‑zeolite is better for high‑temperature, high‑load operation; vanadium is cost‑effective for less demanding applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q3 – SCR的工作原理？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ3\u003c\/span\u003e Working principle of SCR\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eThe SCR system operates through a series of chemical reactions that convert NO\u003csub\u003ex\u003c\/sub\u003e into harmless nitrogen and water. The process can be summarized in the following steps:\u003c\/p\u003e\n      \u003col\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUrea injection:\u003c\/strong\u003e Aqueous urea (AdBlue \/ DEF) is sprayed into the exhaust stream upstream of the SCR catalyst. The heat of the exhaust causes urea to decompose:\u003c\/li\u003e\n        \u003cul\u003e\n          \u003cli\u003eCO(NH₂)₂ + H₂O → 2 NH₃ + CO₂\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNO\u003csub\u003ex\u003c\/sub\u003e reduction:\u003c\/strong\u003e The released ammonia (NH₃) reacts with NO and NO₂ over the catalyst surface:\u003c\/li\u003e\n        \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eStandard SCR:\u003c\/strong\u003e 4 NO + 4 NH₃ + O₂ → 4 N₂ + 6 H₂O\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eFast SCR:\u003c\/strong\u003e NO + NO₂ + 2 NH₃ → 2 N₂ + 3 H₂O\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eSlow SCR:\u003c\/strong\u003e 6 NO₂ + 8 NH₃ → 7 N₂ + 12 H₂O\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAmmonia slip control:\u003c\/strong\u003e An ASC (Ammonia Slip Catalyst) at the outlet oxidises any excess NH₃ that passes through, preventing it from being released into the atmosphere.\u003c\/li\u003e\n      \u003c\/ol\u003e\n      \u003cp\u003eThe \"fast SCR\" reaction (NO + NO₂) is the most efficient and occurs readily when the upstream DOC has converted about 50% of NO to NO₂. The system relies on a precise urea dosing strategy based on engine operating conditions and NO\u003csub\u003ex\u003c\/sub\u003e sensor feedback to achieve \u0026gt; 90% conversion efficiency.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q4 – SCR载体能否单独更换，还是需要整体总成更换？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ4\u003c\/span\u003e Can the SCR substrate be replaced separately, or does the entire assembly need replacing?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003e\u003cstrong\u003eIn most modern vehicles, the SCR catalyst is integrated into a welded metal canister and cannot be replaced as a standalone substrate.\u003c\/strong\u003e The entire assembly (including the housing, sensors, and mounting brackets) must be replaced as a unit.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eReasons why separate substrate replacement is not recommended:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWelded construction:\u003c\/strong\u003e The ceramic substrate is permanently sealed inside the metal can with mounting mats. Cutting it open risks damaging the fragile ceramic and compromising the seal.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePrecision fit:\u003c\/strong\u003e The substrate is precisely sized to the housing; an aftermarket substrate may not fit correctly, leading to exhaust gas bypass and reduced efficiency.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSensor calibration:\u003c\/strong\u003e The new assembly includes the correct sensor locations and mounting points; a modified housing may not align properly.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWarranty and compliance:\u003c\/strong\u003e Replacing only the substrate would void any emissions compliance certification and may trigger OBD fault codes.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003e\u003cstrong\u003eException:\u003c\/strong\u003e In some heavy‑duty and off‑highway applications, the SCR cartridge is designed to be serviceable and the substrate can be replaced individually. However, this is manufacturer‑specific and requires specialised tools.\u003c\/p\u003e\n      \u003cp\u003eFor most vehicles, we strongly recommend replacing the \u003cstrong\u003ecomplete SCR catalytic converter assembly\u003c\/strong\u003e to ensure proper fit, function, and emissions compliance.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q5 – 使用劣质尿素会对SCR催化转化器造成什么损伤？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ5\u003c\/span\u003e What damage does low‑quality urea cause to the SCR catalytic converter?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eUsing low‑quality or non‑compliant urea (AdBlue\/DEF) can cause severe and irreversible damage to the SCR system. The main risks include:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCatalyst poisoning:\u003c\/strong\u003e Impurities such as heavy metals (copper, zinc, chromium) and alkali metals (sodium, potassium) accumulate on the active sites of the SCR catalyst, permanently reducing its NO\u003csub\u003ex\u003c\/sub\u003e conversion efficiency.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDeposit formation:\u003c\/strong\u003e Low‑quality urea often contains aldehydes and biuret, which form solid deposits (melamine and cyanuric acid) inside the catalyst and on the injector. These deposits clog the channels, increase backpressure, and reduce exhaust flow.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInjector damage:\u003c\/strong\u003e Impurities in the urea can cause the dosing injector nozzle to block or stick, leading to over‑dosing or under‑dosing of urea, which affects SCR performance and may trigger OBD fault codes.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCorrosion:\u003c\/strong\u003e Urea with incorrect pH levels can corrode internal components such as the injector, piping, and even the catalyst housing over time.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePremature ageing:\u003c\/strong\u003e The chemical impurities accelerate the thermal degradation of the catalyst coating, especially under high‑temperature regeneration events.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003eTo avoid these issues, always use urea fluid that meets the \u003cstrong\u003eISO 22241\u003c\/strong\u003e standard (DIN 70070 \/ AUS 32) and purchase from reputable suppliers. The cost of repairing a poisoned SCR system far exceeds the savings from buying cheap urea.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q6 – SCR催化剂中毒是什么意思，中毒后可以清洗修复吗 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ6\u003c\/span\u003e What does SCR catalyst poisoning mean? Can it be cleaned and restored?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003e\u003cstrong\u003eSCR catalyst poisoning\u003c\/strong\u003e refers to the accumulation of contaminants on the catalyst surface that block the active sites and prevent the chemical reduction reactions from occurring. Common poisons include:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSulfur (S):\u003c\/strong\u003e From high‑sulfur diesel fuel, forming sulfates that cover the catalyst surface.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePhosphorus (P):\u003c\/strong\u003e From engine oil additives, particularly zinc dialkyldithiophosphate (ZDDP), which forms phosphates.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAlkali metals (Na, K):\u003c\/strong\u003e From certain fuel additives, dust, or contaminated urea.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHeavy metals (Cu, Zn, Cr):\u003c\/strong\u003e From fuel contamination or engine wear.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCarbon deposits (soot):\u003c\/strong\u003e Excessive soot accumulation due to poorly regenerated DPF upstream.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003e\u003cstrong\u003eCan poisoned SCR catalysts be cleaned and restored?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eThermal regeneration\u003c\/strong\u003e – occasionally, running the vehicle at high load for an extended period can burn off carbon deposits and some sulfur compounds. However, this only works for light poisoning.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eChemical washing\u003c\/strong\u003e – some aftermarket services offer SCR flushing with specialised solvents. However, results are inconsistent, and the process risks damaging the fragile ceramic substrate.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSevere poisoning\u003c\/strong\u003e – when the catalyst has been contaminated with heavy metals or phosphates, the damage is \u003cstrong\u003epermanent and irreversible\u003c\/strong\u003e. The catalyst coating cannot be restored. The only solution is to replace the SCR assembly.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003e\u003cstrong\u003eRecommendation:\u003c\/strong\u003e If the SCR efficiency has dropped below 80% and diagnostic trouble codes (P20xx series) are present, replacement is usually the only reliable fix. Cleaning should only be attempted under professional guidance and with the understanding that it may not be effective.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q7 – 新更换SCR催化转化器之后，车辆需要做什么操作？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ7\u003c\/span\u003e What procedures are needed after replacing the SCR catalytic converter?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eAfter installing a new SCR catalytic converter, the following procedures should be carried out to ensure proper operation and OBD compliance:\u003c\/p\u003e\n      \u003col\u003e\n        \u003cli\u003e\n\u003cstrong\u003eReset the ECU:\u003c\/strong\u003e Use a diagnostic tool (e.g., J2534 or manufacturer‑specific software) to clear any old fault codes and reset the SCR adaptation values. This tells the ECU that a new catalyst has been installed.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePerform an SCR re‑learn \/ adaptation:\u003c\/strong\u003e Many vehicles require a \"SCR catalyst learn\" procedure to calibrate the NO\u003csub\u003ex\u003c\/sub\u003e sensors and urea dosing parameters for the new component. This may involve driving at a steady speed or performing a stationary regeneration.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePrime the urea dosing system:\u003c\/strong\u003e The urea pump and injector lines need to be primed with fresh AdBlue\/DEF to remove any air pockets.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCheck for leaks:\u003c\/strong\u003e Inspect all urea connections and exhaust joints for leaks after installation.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTest drive:\u003c\/strong\u003e Drive the vehicle under various load conditions (city, highway, uphill) to allow the SCR to reach operating temperature and to complete the OBD monitor readiness cycles.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eVerify with diagnostic tool:\u003c\/strong\u003e After the test drive, re‑scan the system to confirm that the SCR efficiency monitor has passed and that no new fault codes have appeared.\u003c\/li\u003e\n      \u003c\/ol\u003e\n      \u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Failure to perform the re‑learn procedure may result in persistent fault codes, reduced NO\u003csub\u003ex\u003c\/sub\u003e conversion, and even failed emissions tests.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q8 – SCR催化器堵塞常见是什么原因？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ8\u003c\/span\u003e What are the common causes of SCR catalyst blockage?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eSCR catalyst blockage (increased backpressure) can occur due to several reasons. The most common causes are:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUrea deposit formation (crystallisation):\u003c\/strong\u003e When urea is not fully decomposed due to low exhaust temperatures or poor atomisation, it forms solid deposits of melamine and cyanuric acid inside the catalyst channels.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSoot accumulation:\u003c\/strong\u003e If the upstream DPF is failing or regeneration is incomplete, excessive soot particles pass through and accumulate on the SCR catalyst, blocking the pores.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAsh buildup:\u003c\/strong\u003e Metallic ash from engine oil additives (especially zinc and calcium) accumulates in the SCR over time, reducing the available surface area and increasing backpressure.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePoor urea quality:\u003c\/strong\u003e Low‑quality urea contains impurities (biuret, aldehydes) that form solid precipitates at high temperatures.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFaulty urea injector:\u003c\/strong\u003e A dripping or stuck‑open injector leads to over‑dosing, causing excess urea to crystallise inside the catalyst.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLeaking turbocharger oil seals:\u003c\/strong\u003e Oil contamination can cause sticky deposits that block the catalyst channels.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003e\u003cstrong\u003ePrevention:\u003c\/strong\u003e Use ISO 22241‑compliant urea, maintain the engine and DPF in good condition, and avoid short trips that prevent the SCR from reaching regeneration temperature. Regular inspections of the urea injector and dosing system are also recommended.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q9 – SCR催化转化器失效后车辆会出现哪些故障现象？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ9\u003c\/span\u003e What are the symptoms of a failed SCR catalytic converter?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eWhen an SCR catalytic converter fails or its efficiency drops significantly, the vehicle will typically exhibit one or more of the following symptoms:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCheck Engine Light (MIL) illuminated:\u003c\/strong\u003e The ECU will detect reduced NO\u003csub\u003ex\u003c\/sub\u003e conversion efficiency (e.g., P0420, P20E8, P20EE codes) and turn on the warning light.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eReduced engine power (Derate):\u003c\/strong\u003e Many vehicles enter a \"limp mode\" or reduced power mode when SCR faults are detected, limiting vehicle speed and performance to protect the engine and encourage repair.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIncreased fuel consumption:\u003c\/strong\u003e The engine management system may adjust injection timing and air‑fuel ratio to compensate for the loss of SCR efficiency, increasing fuel consumption.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExcessive white smoke or ammonia smell:\u003c\/strong\u003e Ammonia slip may occur if the SCR cannot convert NH₃ effectively, leading to a pungent odour and visible white smoke from the exhaust.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFailed emission test:\u003c\/strong\u003e The vehicle will fail mandatory emissions inspections or roadside checks due to excessive NO\u003csub\u003ex\u003c\/sub\u003e output.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHigh exhaust backpressure:\u003c\/strong\u003e Blockage causes a noticeable loss of power, reduced turbo response, and increased exhaust gas temperature.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eActive regeneration frequency increase:\u003c\/strong\u003e The DPF may regenerate more often as the ECU tries to compensate for the SCR's poor performance.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003eIf you notice any of these symptoms, we recommend performing a diagnostic scan immediately. Continuing to drive with a failed SCR can lead to damage to other components, including the DPF and turbocharger.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q10 – 如何联系我们（保持不变） --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ10\u003c\/span\u003e How can I contact you?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eYou can reach our team directly via WhatsApp or email. We are happy to assist with any questions about products, sizing, orders, or technical support.\u003c\/p\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eDavin\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8613335696939\" target=\"_blank\"\u003e+86 133 3569 6939\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:KSRCAT@proton.me\"\u003eKSRCAT@proton.me\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eAlison\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8615082475717\" target=\"_blank\"\u003e+86 150 8247 5717\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:Ksrcatalytic@gmail.com\"\u003eKsrcatalytic@gmail.com\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eMia\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8613681711685\" target=\"_blank\"\u003e+86 136 8171 1685\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:Kesairay@proton.me\"\u003eKesairay@proton.me\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cp\u003eWe typically respond within 24 hours (Monday–Saturday). Please include your order number or vehicle details for faster assistance.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e","brand":"SVIPCAT","offers":[{"title":"SCR-400cpsi \/ V-Euro 5 \/ 118x50mm","offer_id":54464432570714,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ V-Euro 5 \/ 118x60mm","offer_id":54464432603482,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ V-Euro 5 \/ 118x76mm","offer_id":54464432636250,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ V-Euro 5 \/ 118x100mm","offer_id":54464432669018,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ V-Euro 5 \/ 118x152mm","offer_id":54464432701786,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Cu-Euro 6 \/ 118x50mm","offer_id":54464432734554,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Cu-Euro 6 \/ 118x60mm","offer_id":54464432767322,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Cu-Euro 6 \/ 118x76mm","offer_id":54464432800090,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Cu-Euro 6 \/ 118x100mm","offer_id":54464432832858,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Cu-Euro 6 \/ 118x152mm","offer_id":54464432865626,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Fe--Euro 6 \/ 118x50mm","offer_id":54464432898394,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Fe--Euro 6 \/ 118x60mm","offer_id":54464432931162,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Fe--Euro 6 \/ 118x76mm","offer_id":54464432963930,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Fe--Euro 6 \/ 118x100mm","offer_id":54464432996698,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true},{"title":"SCR-400cpsi \/ Fe--Euro 6 \/ 118x152mm","offer_id":54464433029466,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/www.svipcat.com\/products\/scr-diesel-catalyst-330mm","provider":"SVIPCAT Store","version":"1.0","type":"link"}