Fitment
Compatible with Mercedes-Benz Euro 6 diesel emission systems (SCR / AdBlue)

Vehicle applications include:
Mercedes-Benz W212
Mercedes-Benz W204
Mercedes-Benz X204
Mercedes-Benz W166
Mercedes-Benz Sprinter
Other Mercedes-Benz diesel vehicles using 5WK966 series NOx sensors

⚠️ Important Note
The part number provided is incomplete (“5WK966”). Mercedes-Benz NOx sensors normally require the full 5WK966xx / A000905xxxx OEM number for exact matching. Compatibility must be confirmed by VIN or full OEM reference.

FAQ

Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide levels in diesel exhaust and sends data to the SCR system to control AdBlue dosing and reduce emissions.

Q2: Is this an inlet or outlet sensor?
A2: The 5WK966 series is used for both inlet and outlet positions depending on vehicle configuration.

Q3: Can I use any 5WK966 sensor?
A3: No, different suffix versions (A, B, C, etc.) have different calibrations and are not interchangeable.

Q4: Is part number matching required?
A4: Yes, the full OEM number is required for correct compatibility.

Q5: What are common failure symptoms?
A5: Engine warning light, AdBlue/SCR faults, NOx sensor error codes, or limp mode.