{"product_id":"0035427118-oxygen-sensor-1","title":"Mercedes Sprinter Upstream Oxygen Sensor – Bosch | T1N \/ NCV3 OM647 \u0026 OM642 | #0035427118 (2003–2012)","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA failed upstream oxygen sensor on a Mercedes Sprinter removes the primary exhaust gas feedback the ECU depends on to maintain correct air-to-fuel ratio — causing rough running, increased fuel consumption, reduced power, and fault codes that won't clear until the sensor is replaced. This is the Bosch upstream oxygen sensor for T1N Sprinters equipped with the OM647 diesel and early NCV3 Sprinters equipped with the OM642 V6 diesel, a direct replacement that restores accurate exhaust gas monitoring and proper engine management.\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 upstream oxygen sensor — also called a pre-cat or lambda sensor — is positioned in the exhaust stream before the catalytic converter and measures the oxygen content of the exhaust gases exiting the engine. The ECU uses this signal to evaluate combustion efficiency and make continuous fuel delivery corrections to maintain the optimal air-to-fuel ratio. On the OM642 V6, the engine has two exhaust banks, each with its own upstream sensor — both sensors must function correctly for balanced fuel control across all six cylinders. When a sensor's element ages, becomes contaminated by oil or coolant, or fails electrically, the ECU loses its primary feedback loop and defaults to open-loop fueling — causing the rough running, black smoke, and fuel economy loss that accompany uncorrected combustion.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eCommon Symptoms of a Failing Upstream Oxygen 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 O2 sensor circuit or performance fault codes\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRough idle or uneven power delivery from uncorrected air-to-fuel ratio\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eIncreased fuel consumption with no other identified cause\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBlack smoke under acceleration from a fuel-rich condition\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCatalytic converter fault codes from upstream sensor data causing inefficient converter operation\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 scan tool with active upstream O2 sensor fault codes. Also inspect and replace both upstream sensors together on the OM642 V6 — sensors age simultaneously and replacing only one leaves the other bank uncorrected.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eT1N \/ NCV3 OM647 \u0026amp; OM642 Specific — VIN Verification Required\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis sensor is for T1N Sprinters with the OM647 5-cylinder diesel and early NCV3 Sprinters with the OM642 3.0L V6 diesel. It is not compatible with NCV3 Sprinters equipped with the 2.1L OM651 or VS30 Sprinters. Always verify your 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\"\u003e2003–2006 Mercedes-Benz \/ Dodge Sprinter 2500 \/ 3500 – OM647 Diesel (T1N)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2007–2009 Dodge Sprinter 2500 \/ 3500 – OM642 Diesel (NCV3)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2007–2008 Freightliner Sprinter 2500 \/ 3500 – OM642 Diesel (NCV3)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2010–2012 Mercedes-Benz Sprinter 2500 \/ 3500 – OM642 Diesel (NCV3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e✔ Upstream (pre-catalyst) position — front left and right\u003cbr\u003e✔ OM642 V6: two sensors required — one per exhaust bank\u003cbr\u003e✔ Always verify by VIN before ordering\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: 0035427118 \/ A0035427118 \/ 003-542-71-18\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCross-reference: 0258017018 \/ 234-5091 \/ 5135667AA\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufacturer: Bosch\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSKU: 0035427118\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueTec Sprinter Parts","offers":[{"title":"Default Title","offer_id":46545257070766,"sku":"0035427118B","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0657\/9077\/1374\/files\/0035427118_graphic.png?v=1788214109","url":"https:\/\/shop.bluetecsprinterparts.com\/products\/0035427118-oxygen-sensor-1","provider":"BlueTec Sprinter Parts","version":"1.0","type":"link"}