Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault on Audi A4

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

RepairPal Verified
Average mileage: 107,761 (72,000–155,000)
Exhaust & Emissions affected: 1.8L 4 Cylinder Turbo
10 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005, 2006
23 people reported this problem
4 people shared problem details
2002 Audi A4155,000
Catalytic converter is bad. :( must replace before next smog check.
1 person likes thisFlag inappropiate
check engine light on
1 person likes thisFlag inappropiate
Crankcase breaker system was replaced to correct check engine light fault. Symptoms were: check engine light and rough idle.
2004 Audi A498,000
Blinking engine light - diagnosis bad hoses, etc in need of immediate repair.
Related Items:
Check water light came on. I checked water reservoir and it appears to have plenty. I know not...
Engine oil leaks are common from the valve cover gaskets and camshaft chain tensioner gasket.
A problem with the torque converter can cause the Check Engine Light to illuminate.

Related Content