{"product_id":"000905841187-nox-sensor","title":"Mercedes Sprinter Rear NOX Sensor – Ampro Technologie | NCV3 3.0L OM642 BlueTec | #000905841187 (2010–2018)","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA failed rear NOx sensor on a NCV3 Sprinter removes the ECU's ability to verify that the SCR catalyst is actually reducing nitrogen oxide emissions after AdBlue injection — triggering fault codes, disabling AdBlue dosing strategy, and putting the van out of emissions compliance until the sensor is replaced. This is the Ampro Technologie rear (downstream) NOx sensor for NCV3 Sprinters equipped with the 3.0L OM642 BlueTec diesel engine, a direct replacement that restores accurate post-SCR NOx measurement and proper aftertreatment system control.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat This Part Does\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe rear NOx sensor — also called the downstream or post-SCR sensor — is positioned after the SCR catalyst in the exhaust aftertreatment system. It measures residual nitrogen oxide levels in the exhaust stream after AdBlue has been injected and the SCR catalyst has processed the exhaust gases. The ECU compares the downstream reading against the upstream front sensor (000905851187) to evaluate SCR conversion efficiency and adjust AdBlue dosing in real time. If downstream NOx levels remain too high, the ECU increases dosing; if they drop too low, it reduces it. Without accurate downstream data, the ECU cannot close this feedback loop — causing the system to default to fault mode, restrict dosing, log SCR efficiency fault codes, and on the BlueTec system, begin the AdBlue countdown sequence.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eCommon Symptoms of a Failing Rear NOx Sensor\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCheck engine light with fault codes related to SCR efficiency, NOx sensor circuit, or AdBlue dosing\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eEngine entering limp mode or power restriction from emissions system fault\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAdBlue consumption that is abnormally high or low with no other identified cause\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eNOx-related fault codes that return after clearing and resetting the SCR system\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eEmissions system warning messages or AdBlue countdown in the instrument cluster\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhen to Replace\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eReplace when the sensor is confirmed faulty by XENTRY or a compatible scan tool with active rear NOx sensor or SCR efficiency fault codes, and the SCR catalyst, AdBlue injector, and dosing system have been ruled out as the primary fault source. When replacing the rear sensor, inspect the front sensor (000905851187) at the same time — both sensors operate as a system and a degraded front sensor will continue to generate efficiency faults even with a new rear sensor installed.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eNCV3 OM642 BlueTec Specific — VIN Verification Required\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis is the rear (downstream\/post-SCR) NOx sensor for NCV3 Sprinters equipped with the 3.0L OM642 BlueTec diesel engine. It is not the front sensor, and it is not compatible with VS30 Sprinters or NCV3 Sprinters without the BlueTec\/AdBlue system. Always verify sensor position, engine code, and VIN before ordering. Contact us and we'll confirm fitment before you buy.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2010–2018 Mercedes-Benz Sprinter 2500 – 3.0L OM642 BlueTec (NCV3\/W906)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2010–2018 Mercedes-Benz Sprinter 3500 – 3.0L OM642 BlueTec (NCV3\/W906)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2010–2018 Mercedes-Benz Sprinter 3500XD – 3.0L OM642 BlueTec (NCV3\/W906)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2016–2023 Mercedes-Benz Metris\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e✔ Rear (downstream\/post-SCR) position only — front sensor requires #000905851187\u003cbr\u003e✔ BlueTec models only — 2010 and later\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003ePart Numbers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eMercedes OEM: 000905841187 \/ A000905841187 \/ 000-905-84-11-87\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCore part number: 0009058411 \/ A0009058411\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufacturer: Ampro Technologie — A1038411\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSKU: 000905841187\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueTec Sprinter Parts","offers":[{"title":"Default Title","offer_id":46496630669486,"sku":"000905841187","price":499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0657\/9077\/1374\/files\/000905841187-NOXSENSOR.jpg?v=1749046056","url":"https:\/\/shop.bluetecsprinterparts.com\/products\/000905841187-nox-sensor","provider":"BlueTec Sprinter Parts","version":"1.0","type":"link"}