FITMENT:
Compatible with Mercedes-Benz SL-Class R231 and related Euro 6 petrol/diesel SCR systems, including:

• R231 SL350 (2012–2013)
• R231 SL400 (2015–2018)
• Some CLS / E-Class variants using the same SCR NOx sensor family

OEM / Cross reference numbers:

• A0009053703
• 0009053703
• 5WK96703C / 5WK9 6703C

This NOx sensor is used in Mercedes-Benz emissions systems to measure nitrogen oxides in exhaust gases and support SCR/engine management strategy. It is typically installed as part of the exhaust aftertreatment system for emission control.

FUNCTION:

• Measures nitrogen oxide (NOx) levels in exhaust gas
• Sends real-time data to ECU for emissions control strategy
• Supports SCR efficiency and catalyst monitoring
• Helps maintain Euro 6 emissions compliance

INSTALLATION POSITION:

• Exhaust system SCR sensor location (vehicle dependent)
• Mounted near catalytic converter / aftertreatment section

FAQ:

Q1: Is this inlet or outlet sensor?
A1: It depends on SL-Class configuration. A0009053703 can be used in SCR inlet or outlet position depending on engine and exhaust layout.

Q2: What vehicles does it fit?
A2: Mainly Mercedes SL R231 SL350 and SL400 models, plus some related CLS/E-Class variants using the same SCR system.

Q3: What are failure symptoms?
A3: Check engine light, SCR/AdBlue warning, reduced performance, or emissions fault codes.

Q4: Is it interchangeable with aftermarket 5WK96703C?
A4: Yes, 5WK96703C is the Continental manufacturer reference for Mercedes OEM A0009053703.

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