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Use only Audi OE quality replacement Catalytic Converters to keek your Audi 80 in the best running condition. DriveWire sells only California legal 80 OBD-II Converters.
If your Audi 80 failed the emissions test due to high NOX, the EGR Valve is most likely the issue. If your Audi is running rough or has poor fuel mileage, replace the 80 EGR Valve and gasket.
The Audi 80 Oxygen sensor is a critical part of the emmision control system and should be replaced as soon as it fails. Make sure to check the Audi 80 diagnosics codes for proper replacement of the O2 Sensor.