17965high severityPowertrain
Charge Pressure Control Positive Deviation
on 2002 Audi allroad 2.7L Twin-Turbo V6 · AWD
What this code means
Actual boost pressure is higher than the commanded target, indicating overboost from the turbo control system. Equivalent to OBD code P1557.
Symptoms
- Reduced engine power / limp mode
- Check engine light on
- Surging or jerky acceleration
Common causes
- Stuck or faulty wastegate
- Faulty boost pressure sensor
- Failed N75 boost control valve
- Vacuum hose leak or blockage
Diagnostic steps
- Read boost pressure actual vs specified
- Test wastegate actuator operation
- Inspect vacuum lines and N75 valve
- Check boost sensor readings
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