Lambda sensor for Audi A4 (B5) 6-cylinder petrol (upstream of the catalytic converter)

Oxygen sensor located before the catalytic converter, 2 required per vehicle,

For A4 (B5):
- 2.4 163 hp (APZ)
- 2.4 165 hp (APS, AML, ARJ)
- 2.8 193 hp (APR, AQD, AMX)
- S4 265 hp (AGB) Tip: To determine whether the cause of your vehicle's excessive pollution is due to the Lambda sensor(s), have a diagnostic test carried out at your garage.
Mecatechnic will not accept any returned sensors with signs of having been fitted. Thank you for your understanding