Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Audi A4 Base, 1.8 C, StandardFACTORY OEM SERVICE PROCEDURE
Test sequence
- Connect vehicle diagnostic, testing and information system VAS 5051. See VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS
. Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle.
Display on VAS 5051:
- Under -1- select diagnostic function "08 - Read measured value block".
Display on VAS 5051:
Courtesy of AUDI OF AMERICA, INC.
- Enter display group
- Enter "020" for "display group number 020" in zone -2- and confirm entry by pressing the -Q- button.
Display on VAS 5051:
- Check knock control in display zones -1- to -4-.
DISPLAY GROUP 020: IGNITION KNOCK RECOGNITION CONTROL WHILE DRIVING
| Display zones | ||||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Display group 020: Ignition knock recognition control while driving | ||||
| Display | xx.x °KW | xx.x °KW | xx.x °KW | xx.x° KW |
| Display | Ignition timing retardation by knock recognition control, cylinder 1 | Ignition timing retardation by knock recognition control, cylinder 2 | Ignition timing retardation by knock recognition control, cylinder 3 | Ignition timing retardation by knock recognition control, cylinder 4 |
| Specified value | 0...12 °Crankshaft | 0...12 °Crankshaft | 0...12 °Crankshaft | 0...12 °Crankshaft |
| Note: | Evaluation. See EVALUATION IGNITION ANGLE RETARDATION . | |||
NOTE:
The numbers displayed in display zones 1 to 4 represent the actual ignition timing retardation due to the knock control of the individual cylinders. The ignition angle retardation is carried out late in ° KW (crankshaft degree).
- Exit function "08 - Read measured value block" by pressing < button.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.