Audi A6 Quattro Problem Report

Audi A6 Quattro Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault

(24 reports)

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

Check engine light is on, code is reading O2 sensor -
the engine light is on and i cant drive the car cause it will cut off and oil is leaking -
Have been told that it is the O2 sensor. I have had them replaced and the CEL is back after 10k miles. -
catalytic converter insufficient flow cause CEL on -
vacuum leak code (p4117)sacyrus70@icloud.com -
Have this problem as well, need to assemble funds to fix it. -
check ingine light car seems to slow down and pick up at times -
CEL on. Checked OBDCOM--diagnoses was improper Catalytic converter air mixture coming from back O2 Sensors. Will replace catalytic converters and O2 sensors. -
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