Knock recognition control stop, checking
The following tests must be performed when a DTC is stored that relates to "knock recognition control limit reached".
| Possible cause | Corrective action | |
|---|---|---|
| DTC for all cylinders or DTC for all cylinders in one row | Poor fuel quality | Change fuel quality (see operating instructions) |
| Knock sensor tightened to incorrect torque | Loosen knock sensors and tighten to 20 Nm | |
| Knock sensor faulty | Check knock sensors KNOCK SENSORS, CHECKING | |
| Corrosion at harness connector | ||
| Engine accessories loose | Secure engine accessories | |
| DTC for one Cylinder | Engine damage | Check compression pressure |
| Engine accessories loose | Secure engine accessories | |
KNOCK RECOGNITION CONTROL STOP CHART
- Also check ignition angle retardation of individual cylinders. See «CHECK IGNITION ANGLE RETARDATION OF THE INDIVIDUAL CYLINDERS»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq__check-ignition-angle-retardation-of-the) .