Allroad Quattro

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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 125,083 (50,000–200,000)
Exhaust & Emissions affected: 2.7L V6 Turbo
5 model years affected: 2001, 2002, 2003, 2004, more2005
23 people reported this problem
Viewing 1 - 8 of 8 comments
It's saying both my secondary air injectors are failing and both my Catalytic converters are failing right now.
Have a vacume leak that got worse tried to fiddle around an see exactly where it was coming from an broke the line completley now check engine light is on
P1131 o2 Sensor Bank2 Sensor 1 Internal Resistance too high
Oxygen sensor code keeps coming on and now it has the code for P0741 which is the transmission having to do with the torque converter.
engine light on - dealership says it is a vaccuum seal issue. quote of $425 to fix
replaced oxygen sensor
Vacuum leak causing "check engine" alert