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

• W205 / S205 (C180, C200, C220, C250 diesel variants)
• W447 (Vito / V-Class diesel)
• C207 / A207 (E-Class coupe/cabrio diesel variants in some setups)
• Selected CLA / GLA / GLC diesel models (engine-dependent)

OEM reference numbers:

• A0009056304
• 0009056304
• 5WK97250

This NOx sensor is used in Mercedes SCR exhaust aftertreatment systems to measure nitrogen oxide levels and control AdBlue dosing for emissions compliance.

FUNCTION:

• Measures NOx concentration in exhaust gases
• Sends real-time data to ECU via CAN communication
• Controls SCR/AdBlue injection strategy
• Maintains Euro 6 emissions compliance and catalyst efficiency

INSTALLATION POSITION:

• SCR system inlet or outlet sensor (depends on vehicle configuration)
• Mounted on exhaust line near DPF and SCR catalyst

FAQ:

Q1: Is this inlet or outlet sensor?
A1: It can be used as either inlet or outlet depending on Mercedes SCR system layout. OEM matching is required.

Q2: What vehicles does it fit?
A2: Commonly used on W205 C-Class and W447 Vito/V-Class diesel models with SCR systems.

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

Q4: Are A0009056304 and 5WK97250 the same?
A4: Yes, 5WK97250 is the sensor manufacturer (Continental) reference for Mercedes OEM A0009056304.

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