Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault on Audi TT

Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.

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Average mileage: 74,598 (31,000–131,000)
Exhaust & Emissions affected: 1.8L 4 Cylinder Turbo
7 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006
17 people reported this problem
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problem details
2004 Audi TT 50,300 mi,
eplaced the oxygen sensor and the light came back on. The mechanic now says that it is a computer failure
2001 Audi TT 31,000 mi,
Engine check light on. Audi review noted oxygen sensor, another auto repair mentioned it may be some else which caused this to happen. Review turned up nothing. I now want an dedicated audi TT repair location other than the dealer to check problem. Any suggestions.
engine lite came on and the headlights went dim...
2002 Audi TT 94,330 mi,
chick engine light came om ran car over to ato dealer and found banks 2 catas to at faults
2002 Audi TT 108,000 mi,
CEL on, replaced MAF CEL back on two days later! Common in German cars, same problem with Mercedes SLK 230 Kompressor. Never resolved after multiple repairs.
2004 Audi TT 60,000 mi,
Chk Engine Light--had faults for catalyst and coolant system performance. Quoted repair $500 for thermostat replacement.