audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Checking knock sensors > < Checking control unit voltage supply
Motronic fuel injection and ignition system (6 cyl.)
Checking ignition system
Checking knock control stop

If a fault entry relating to "knock control stop reached" is made, carry out the following checks:

Possible cause of fault

Fault remedy

Fault entry for all cylinders

- Poor fuel quality

- Change fuel quality
(see operating instructions)

or
Fault entry for all cylinders of one bank

- Knock sensor tightened to incorrect torque

- Loosen sensor and tighten to 20 Nm.

- Knock sensor defective

- Check knock sensor

- Corrosion on connector

- Loose components on engine

- Secure components

Fault entry for one cylinder

- Engine fault

- Check compression pressure

- Loose components on engine

- Secure components

Checking knock sensors > < Checking control unit voltage supply