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Service bulletin 0504

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10015999
Published by NHTSA2005-08-18
Manufacturer's number0504
Manufacturer's date2005-07-20
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR

NHTSA's summary

THREE WAY CATALYST, CATALYTIC EFFICIENCY DIAGNOSTIC TROUBLE CODES (DTCS) STORED IN DTC MEMORY. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Exhaust and emissions, Catalytic converter

Vehicles listed
AUDI A42000, 2001
AUDI A62000, 2001

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
05022005-07-29. Service bulletin. UPDATE PROGRAMMING FOR CATALYTIC CONVERTER SYSTEM (IC). *TT UPDATE. *TT