Lambda sensor behind catalytic converter for New Beetle

For New Beetle from 04/99 ->12/01:
- 2.0115hp (AEG, AQY) downstream from the catalytic converter Tip: to determinewhether or not the excessive contamination of your vehicle is caused by the Lambda sensor(s), have your garage carry out a diagnostic test.
Mecatechnic will not accept any returned sensors with signs of having been fitted. Thank you for your understanding.