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

• ML / M-Class W164 / W166
• GL / GLS X164 / X166
• E-Class W212 / S212 / C207 / A207
• C-Class W205 / S205
• S-Class W221 / W222 / V222 / X222
• CLS C218 / X218
• GLK X204
• Sprinter W906 / Vito W447 (select SCR variants)

OEM / Cross reference numbers:

• A0009051612 / A 000 905 16 12
• 5WK96682A / 5WK96682C (Continental variants)
• A3C03398700-622 / BNX74058 (aftermarket references)

This NOx sensor is part of the Mercedes SCR exhaust aftertreatment system, used to measure nitrogen oxide levels in diesel exhaust and regulate AdBlue dosing for emissions control.

FUNCTION:

• Measures NOx concentration in exhaust gas
• Sends data to ECU via CAN communication
• Controls SCR/AdBlue injection strategy
• Monitors catalyst efficiency and emissions performance
• Ensures Euro 5 / Euro 6 compliance

INSTALLATION POSITION:

• SCR system inlet or outlet sensor (depends on engine configuration)
• Mounted on exhaust line between DPF and SCR catalyst or after SCR system

IMPORTANT NOTE:
A0009051612 belongs to a widely used Mercedes NOx sensor family, meaning:

• Same physical design used across many platforms
• Inlet/outlet versions are NOT interchangeable
• ECU calibration determines correct function
  Incorrect installation can cause SCR faults, AdBlue errors, or limp mode.

FAQ:

Q1: What vehicles does it fit?
A1: ML W164/W166, GL X164/X166, E-Class W212/W205/W222, S-Class W221/W222 and related diesel SCR models.

Q2: Is this inlet or outlet sensor?
A2: It can be used as inlet or outlet depending on SCR system configuration.

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

Q4: Are 5WK96682A and A0009051612 the same?
A4: Yes, 5WK96682A is the Continental reference for Mercedes OEM A0009051612 family.

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