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

• E-Class W213 / S213 (E220d / E300d OM654 engines)
• CLS C257 / X257
• S-Class W222 / V222 (diesel variants)
• Some Sprinter W907 / Vito W447 SCR configurations (platform-dependent)
• Related OM654 SCR diesel engines

OEM / Cross reference numbers:

• A0009057108 / A 000 905 71 08
• 5WK96781A / 5WK9 6781A (sensor family platform)
• A0009059112 / A0009050914 / A0009053009 (superseded variants depending on ECU version)

SOURCE CONFIRMATION:
This sensor is a genuine Mercedes SCR NOx sensor used on OM654 diesel engines, widely fitted on W213 E220d and related platforms.
It is commonly sold as a complete NOx probe + control module assembly for Euro 6 systems.

FUNCTION:

• Measures nitrogen oxide (NOx) levels in diesel exhaust
• Sends real-time data to ECU via CAN communication
• Controls AdBlue (DEF) injection in SCR system
• Monitors catalyst efficiency and emissions compliance
• Prevents engine derate and SCR system faults

INSTALLATION POSITION:

• SCR inlet or outlet NOx sensor (position depends on W213/C257 configuration)
• Mounted on exhaust line before or after SCR catalyst
• Used in paired system (upstream + downstream NOx monitoring)

IMPORTANT NOTE:
A0009057108 is part of a new-generation Mercedes NOx sensor family, meaning:

• Same physical sensor used across multiple OM654 platforms
• Inlet and outlet versions are NOT interchangeable
• ECU software version (V1/V2/V3 calibration) determines correct usage
• Often requires SCR reset after replacement

Incorrect matching may cause: SCR faults, AdBlue warnings, or limp mode.

FAQ:

Q1: What vehicles does it fit?
A1: E-Class W213 E220d/E300d, CLS C257, S-Class W222 diesel models.

Q2: Is this inlet or outlet sensor?
A2: It can be inlet or outlet depending on SCR system layout and ECU mapping.

Q3: What are failure symptoms?
A3: SCR warning light, engine derate, AdBlue system faults, NOx sensor errors.

Q4: Are A0009057108 and 5WK96781A the same?
A4: Yes, 5WK96781A is the Continental reference platform for Mercedes OEM A0009057108.

Q5: Does installation require coding?
A5: Some vehicles require SCR adaptation or ECU reset after replacement.