Audi TT Quattro
Report: Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault
Audi TT Quattro Problem
Exhaust & Emissions Affected: 1.8L 4 Cylinder Turbo
Average Mileage: 86,333 mi (55,333 mi - 105,000 mi)
Visitor, 2000 Audi TT Quattro, 100,000 mi
Check engine light will not stay off, says it is the O2 Swnsor. Replaced it and now its back on..Frustrated.
Visitor, 2002 Audi TT Quattro
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.
Visitor, 2004 Audi TT Quattro, 85,000 mi
replace o2 sensor