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.
Knock recognition control stop, checking: Notes
1999 Audi A6 QuattroSECTION Notes
The following tests must be performed when a DTC is stored that relates to "knock recognition control limit reached".
KNOCK RECOGNITION CONTROL STOP CHART
| Possible cause | Corrective action | |
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| DTC for all cylinders or DTC for all cylinders in one row |
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| DTC for one Cylinder |
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- Also check ignition angle retardation of individual cylinders. See CHECK IGNITION ANGLE RETARDATION OF THE INDIVIDUAL CYLINDERS .
RENDER: 1.0x
NO RELATED
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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.