Idle vibrations on the AXR engine (74kW PD TDI) (Solution)

Translated on 20-07-2026, 3:29.

Hello,

To all AXR drivers experiencing idling vibrations and jolting:

Technical troubleshooting.

Problem description:
Rough idle or hesitation after a prolonged period of acceleration.

Cause:
Tolerances in software tuning.

- The engine is running roughly at idle and transmitting very unpleasant vibrations into the interior.
By turning on the rear window defroster, the idle becomes much smoother. ... The lights also work...
- After a period of acceleration and then slight acceleration, a noticeable jerk can be felt.

This applies only to vehicles equipped with the engine control unit (ECU) with part number 038 906 019 CR.

Serial solution.
Starting in 2001, a modified steering device was used - part number 038 906 019 AT ... that's exactly how it's written... .
This control unit is not backward compatible.
... the AXR was built starting in 9/2001...

KD solution.

Make sure there are no error codes stored in the system and that there are no leaks in the charge air system.

If an error has been registered, please proceed according to the guided troubleshooting steps.

If there are no error codes in the diagnostic memory and no leaks can be detected, install a new engine control unit (part number 038 906 019 MQ).

- The KD control unit has the coding 00012.
- Please code the engine control unit using the vehicle's self-diagnostic system to the value 00012.