Anti-theft immobilizer On Board Diagnostic (OBD), initiating

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Audi S8, 2003 Audi A8, 2002 Audi S8, 2002 Audi A8, and 2001 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.

If malfunctions occur in the sensors and components being monitored, they will be stored in the Diagnostic Trouble Code (DTC) memory together with an indication of the type of malfunction.

A maximum of 4 DTCs can be stored simultaneously.

Sporadic malfunctions are automatically cancelled if they are not repeated in next 50 engine starts.

Effective calendar date 03.11.2002, On Board Diagnostic of the anti-theft immobilizer system are to be carried out using either the VAS 5051 or VAS 5052 Vehicle Diagnostic Testing and Information System.

NOTE:

Display fields in function 08 - Read Measuring Value Block are read-out vertically.
While the display field contents are identical between the VAS 5051/5052 and VAG 1551, the display format is different.

Effective calendar date 03.11.2002, the immobilizer secret number is encoded for increased security. The encoded number is now 7-digits and is referred to as a "PIN" ("Personal Identification Number").

All models with anti-theft immobilizer are affected, regardless of generation.

The process to obtain the 7-digit PIN remains the same as with the 4-digit "secret number previously used - that is: request via the "Warranty Information Network" (WIN). However, WIN Administration now requires additional information from both the vehicle and Dealer in order to generate the 7-digit PIN.

The PIN is only valid on the day it is requested. Thereafter, a new PIN is required.

The 7-digit PIN can only be processed and input using either the VAS 5051 or VAS 5052 with basis CD version 3.10 and higher. VAG 1551/1552 Scan Tools are unable to process or input this number.

A correct Importer/Dealer number must reside in the VAS 5051/5052 in order to request a PIN.

The requested PIN is worthless to other Dealers.

CAUTION:

All Dealership VAS 5051 and VAS 5052 testers in service MUST be programmed with the correct Importer/Dealer number, as well as correct date and time.
Adaptation functions of the anti-theft immobilizer are not possible with incorrect data!

NOTE: The following description and illustrations deal specifically with the VAG1551 scan tool. VAG 1552 procedures are similar, but printing is not possible.