P3004high severityPowertrain
Turbo/Supercharger Wastegate Actuator Stuck Open
on 2010 Mini Cooper 1.6L I4 · FWD
What this code means
The wastegate actuator is stuck in the open position, preventing the turbo from building proper boost pressure.
Symptoms
- Check Engine Light
- No boost pressure
- Significant loss of power
- Engine feels naturally aspirated
- Poor acceleration at all speeds
Common causes
- Wastegate actuator rod seized
- Actuator diaphragm ruptured
- Wastegate valve carbon buildup
- Vacuum line disconnected
- Actuator linkage broken
Diagnostic steps
- Check wastegate actuator vacuum line
- Manually operate wastegate actuator rod
- Inspect actuator diaphragm for leaks
- Check for carbon deposits on wastegate valve
- Verify boost pressure with gauge
Repair notes
Replace wastegate actuator. Clean carbon from wastegate valve and housing. Check turbo shaft play.
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