Fitment

Compatible with Volkswagen Group diesel vehicles equipped with 3.0 TDI engines and SCR (Selective Catalytic Reduction) emission systems.

This part number is commonly used in VAG diesel exhaust aftertreatment systems for nitrogen oxide (NOx) monitoring and emission control.

• 059907807AB
• SNS452
• Volkswagen / Audi / Porsche / VAG 3.0 TDI diesel engine applications
• SCR / AdBlue diesel emission systems

Fitment depends on engine code, model year, and ECU calibration.

Technical Description

This NOx sensor is installed in diesel exhaust systems to measure nitrogen oxide concentration in the exhaust gas stream.

It sends real-time data to the engine control unit (ECU) to support SCR system dosing strategy and emission regulation in diesel aftertreatment systems.

Symptoms / Fault Codes

Common symptoms of a faulty NOx sensor may include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR system warning
• Reduced engine performance / limp mode
• Increased emissions

OE / Part Numbers

• 059907807AB
• SNS452

FAQ

What does a NOx sensor do?

It measures nitrogen oxide levels in diesel exhaust systems and sends data to the ECU for emission control in SCR systems.

Where is it used?

It is used in Volkswagen Group 3.0 TDI diesel engines equipped with SCR/AdBlue systems to monitor exhaust gases before or after the catalyst depending on configuration.

What happens if it fails?

It may trigger emission system warnings, fault codes, and reduced engine performance depending on ECU strategy.

Is SNS452 interchangeable with other NOx sensors?

Not always. Even if physical connectors appear similar, compatibility depends on OE number and ECU calibration.