Car Problem Reports

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

Audi TT Quattro Problem
15 Reports
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Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005, 2006

Exhaust & Emissions Affected: 1.8L 4 Cylinder Turbo

Average Mileage: 82,466 mi (55,333 mi - 105,000 mi)


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

  • Appears to be the caused by the failure of the air pump and air valve. Apparently a common problem as I have a friend with a simliar age TT that has the same issue. The pump keeps the fuel tank pressurized so if it fails the diagnostic system thinks there is a vacuum leak.The car will fail an emisions test, but the car is still usable until you can get it fixed. Cost is around $800.

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  • Visitor, , 67,000 mi

    engine light on. shop says maf sensor problem

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  • Visitor, , 100,000 mi

    Check engine light will not stay off, says it is the O2 Swnsor. Replaced it and now its back on..Frustrated.

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  • Visitor, , 85,000 mi

    replace o2 sensor

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