Mercedes Sprinter Rear NOX Sensor – Genuine OEM | VS30 3.0L OM642 Diesel | #0009059112 (2019–2023)

A failed rear NOx sensor on a VS30 Sprinter with the OM642 removes the ECU's ability to verify that the SCR catalyst is actually reducing nitrogen oxide emissions — triggering fault codes, disabling AdBlue dosing strategy, and putting the van out of emissions compliance until the sensor is replaced. This is the Genuine Mercedes-Benz OEM rear NOx sensor for VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine, a direct replacement that restores accurate downstream NOx measurement and proper aftertreatment system control.

What This Part Does

The rear NOx sensor — also called the downstream or post-catalyst NOx 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 NOx sensor 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, and log SCR efficiency fault codes.

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 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. Always use OEM to ensure the sensor's calibration matches the ECU's expected signal range — aftermarket NOx sensors are known to produce signal drift that causes persistent faults even after installation.

VS30 3.0L OM642 Specific — VIN Verification Required

This is the rear (downstream) NOx sensor for VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine. It is not compatible with VS30 models equipped with the 2.0L OM654 or the 2.1L OM651. Always verify sensor position, engine code, and VIN before ordering. Contact us and we'll confirm fitment before you buy.

Fitment

• 2019–2023 Mercedes-Benz Sprinter 1500 – 3.0L OM642 Diesel (VS30)
• 2019–2023 Mercedes-Benz Sprinter 2500 – 3.0L OM642 Diesel (VS30)
• 2019–2023 Mercedes-Benz Sprinter 3500 – 3.0L OM642 Diesel (VS30)
• 2019–2023 Mercedes-Benz Sprinter 4500 – 3.0L OM642 Diesel (VS30)

✔ Rear (downstream/post-SCR) position only ✔ OM642 3.0L V6 engine only — not compatible with OM654 or OM651

Part Numbers

• Mercedes OEM: 0009059112 / A0009059112 / 000-905-91-12
• Cross-reference: 0009054114 / A0009054114
• Manufacturer: Genuine Mercedes-Benz
• SKU: 0009059112