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

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

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Average mileage: 121,692 (80,000–200,000)
Exhaust & Emissions affected: 2.7L V6 Turbo
5 model years affected: 2000, 2001, 2002, 2003, more2004
25 people reported this problem
8 people shared problem details
2001 Audi A6 Quattro100,000
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.
2002 Audi A6 Quattro120,000
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
2002 Audi A6 Quattro128,000
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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