Attachment Bulletin # 260504
Group: 26Number: 05-04
Date: July 20, 2005
Subject:
Three Way Catalyst, Catalytic Efficiency DTCs Stored in DTC Memory
Model(s):
A4 W/2.8L (Eng. Code ATQ) 2000, 2001 > 8D_1A 005 394
A6 W/2.8L (Eng. Code ATQ) 2000, 2001 > 4B_1N 006 888
Condition
The Diagnostic Trouble Codes (DTCS) or even an illuminated MIL may be present:
This may be due to the On Board Diagnosis OBD for the Catalytic Converter system which is too sensitive and sets fault codes without a defect in the catalyst system.
Service
- If diagnosis of the engine does not reveal a faulty component, reprogramming of the ECM will be necessary.
- Please refer to the Technical Bulletin 26-05-03 (IC)