Fitment

Based on OEM catalog cross-reference data, this NOx sensor family is used across Audi A8 (4H platform) and related Volkswagen Group V6/V8 TDI diesel SCR systems.

Typical applications include:

• Audi A8 (4H / D4 platform) 3.0 TDI
• Audi A8 4.2 TDI (selected variants)
• SCR (AdBlue) diesel emission systems
• Rear / downstream NOx sensor positions depending on exhaust configuration

Fitment is strictly based on OE number matching and revision grouping:
4H0907807E / 4H0907807D / 4H0907807J / 4H0907807F / 4H0907807M

Technical Description

This NOx sensor is used in diesel exhaust aftertreatment systems to measure nitrogen oxide (NOx) concentration in exhaust gases.

It provides real-time feedback to the ECU to control SCR (Selective Catalytic Reduction) operation, including AdBlue dosing strategy and emissions compliance management.

This part family represents multiple hardware revisions used within the same platform generation, often differing by mounting position or calibration.

Symptoms / Fault Codes

Common symptoms of failure may include:

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

OE / Part Numbers

• 4H0907807E
• 4H0907807D
• 4H0907807J
• 4H0907807F
• 4H0907807M

FAQ

What does this NOx sensor do?

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

Are all these part numbers interchangeable?

Not always. Even though they belong to the same 4H family, suffix differences (E / D / J / F / M) can indicate different positions (upstream/downstream), calibration, or ECU compatibility.

Is this sensor vehicle-specific?

Yes. Compatibility is strictly determined by OE number matching. Audi A8 (4H platform) is the primary application family.

Can similar NOx sensors be used instead?

No. NOx sensors are ECU-calibrated components and must match exact OE specification.