Audi A4 Problem Report

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

(22 reports)

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

Catalytic converter is bad. :( must replace before next smog check. -
check engine light on -
Blinking engine light - diagnosis bad hoses, etc in need of immediate repair. -
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