FITMENT:
Compatible with Mercedes-Benz diesel vehicles equipped with SCR (AdBlue/DEF) Euro 5 / Euro 6 systems, including:

• E-Class W212 / S212 / C207 / A207 (E200 / E220 / E250 CDI variants)
• CLS W218 / X218
• S-Class W222 / V222 / X222 (diesel SCR versions)
• GLK X204
• Sprinter W906 / W447 (diesel SCR variants)
• Vito / V-Class W447
• R-Class V251

OEM reference numbers:

• A0009052210
• 0009052210
• 5WK97241 / 5WK9 7241 (commonly paired sensor family reference)

This is a Mercedes SCR system NOx sensor used to measure nitrogen oxide levels in exhaust gas, supporting AdBlue dosing and emissions control.

FUNCTION:

• Measures NOx concentration in diesel exhaust
• Sends real-time data to ECU via CAN communication
• Controls SCR (AdBlue) injection strategy
• Ensures Euro 5 / Euro 6 emissions compliance
• Helps prevent engine derate and SCR faults

INSTALLATION POSITION:

• SCR system inlet or outlet sensor (depends on vehicle configuration)
• Mounted on exhaust pipe before or after SCR catalytic converter

IMPORTANT NOTE:
A0009052210 belongs to a widely used Mercedes NOx sensor family. Different suffixes (2210 / 5100 / 6100 variants) may look similar but differ in:

• Sensor calibration
• Connector type
• Software coding (ECU pairing)

Always match OEM number exactly.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: It can be used as either inlet or outlet depending on Mercedes SCR system layout and engine type.

Q2: What vehicles does it fit?
A2: Commonly used on E-Class W212, CLS W218, S-Class W222, Sprinter W906/W447, and related diesel SCR models.

Q3: What are failure symptoms?
A3: SCR/AdBlue warning light, engine limp mode, incorrect NOx readings, or emissions fault codes.

Q4: Are A0009052210 sensors interchangeable with other NOx sensors?
A4: Not directly—Mercedes NOx sensors must match exact part number and calibration version.

Q5: Does it require programming after installation?
A5: Some Mercedes models require SCR reset or ECU adaptation after replacement.