Engine Controls - MIL ON / DEC P0420 In ECM
26 08 032019217/1
November 18, 2008
Affected Vehicles
01 MIL on (DTC P0420 in ECM)
Condition
- DTC P0420 (Catalyst System, Bank 1 Efficiency Below Threshold) is stored in the ECM.
- MIL on.
- Vehicle may idle rough.
This condition does not cause stalling or drivability concerns.
Technical Background
N/A
Production Solution
N/A
Service
Audi of America is requesting your cooperation in supplying us with technical information regarding this condition.
Audi of America is requesting that the following procedure be followed:
1. Verify DTC P0420 is stored in memory.
2. If the vehicle is within the New Vehicle Limited Warranty, contact Audi Technical Assistance Center (TAC) before proceeding.
Please attach DTC and Diagnostic Log to TAC contact.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Required Parts and Tools
N/A
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.