Fitment (Market-Validated Usage)

Based on OEM cross-reference catalogs, Continental SNS921 documentation, and aftermarket supplier listings, this NOx sensor is used in Renault–Nissan–Mercedes shared diesel SCR (AdBlue) systems, mainly on light commercial and compact diesel platforms.

Common system applications include:

• Renault Kangoo II 1.5 dCi (Euro 6 SCR)
• Renault Kangoo Express / Grand Kangoo
• Mercedes-Benz Citan W415 1.5 dCi
• Nissan NV250 1.5 dCi
• Renault–Nissan small commercial diesel SCR platforms

Fitment is strictly based on OE number matching:
227903512R / SNS921 / A2C16635500-04

OE cross-reference data confirms this sensor belongs to the Continental/VDO SNS921 NOx sensor family used across shared Renault–Mercedes–Nissan diesel SCR systems.

Technical Description

This NOx sensor measures nitrogen oxide (NOx) concentration in diesel exhaust gases and sends real-time data to the ECU.

It is part of the SCR (Selective Catalytic Reduction) system, which uses AdBlue (urea solution) to reduce NOx emissions and meet Euro 6 standards.

The sensor is an integrated electronic module designed for high-temperature exhaust environments with continuous emissions monitoring and ECU communication.

Symptoms / Fault Codes

• Check engine light
• SCR / AdBlue system warning
• NOx sensor communication or signal faults
• P2200 / P229F type codes (system dependent)
• Reduced engine power (limp mode)
• Increased emissions

OE / Part Numbers

• 227903512R
• SNS921
• A2C16635500-04 / A2C16635500-03
• Continental / VDO SNS921 sensor family

FAQ

Is this sensor vehicle-specific?

Yes. NOx sensors must match the exact OE number. Even small suffix differences (512R / 342R / 461R variants) can affect calibration, connector type, or ECU pairing.

Why do Renault, Nissan, and Mercedes appear together?

Because these brands share the same small diesel SCR architecture (Kangoo / Citan / NV250 platforms), using identical emission system components.

Can similar OE numbers be used instead?

Not recommended. NOx sensors are ECU-coded emission components and must match exact OE specification to avoid SCR faults or limp mode.