Mercedes Sprinter Rear NOX Sensor – Ampro Technologie | NCV3 3.0L OM642 BlueTec | #000905841187 (2010–2018)

A 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.

What This Part Does

The 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.

Common Symptoms of a Failing Rear NOx Sensor

• Check engine light with fault codes related to SCR efficiency, NOx sensor circuit, or AdBlue dosing
• Engine entering limp mode or power restriction from emissions system fault
• AdBlue consumption that is abnormally high or low with no other identified cause
• NOx-related fault codes that return after clearing and resetting the SCR system
• Emissions system warning messages or AdBlue countdown in the instrument cluster

When to Replace

Replace 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.

NCV3 OM642 BlueTec Specific — VIN Verification Required

This 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.

Fitment

• 2010–2018 Mercedes-Benz Sprinter 2500 – 3.0L OM642 BlueTec (NCV3/W906)
• 2010–2018 Mercedes-Benz Sprinter 3500 – 3.0L OM642 BlueTec (NCV3/W906)
• 2010–2018 Mercedes-Benz Sprinter 3500XD – 3.0L OM642 BlueTec (NCV3/W906)
• 2016–2023 Mercedes-Benz Metris

✔ Rear (downstream/post-SCR) position only — front sensor requires #000905851187
✔ BlueTec models only — 2010 and later

Part Numbers

• Mercedes OEM: 000905841187 / A000905841187 / 000-905-84-11-87
• Core part number: 0009058411 / A0009058411
• Manufacturer: Ampro Technologie — A1038411
• SKU: 000905841187