2A88moderate severityPowertrain
Exhaust VANOS Control Fault / Timing Over-Advanced, Bank 1
on 2021 BMW i3 Range Extender · RWD
What this code means
The exhaust VANOS system shows a control fault or over-advanced camshaft timing (OBD P0014). The ECU detects the exhaust camshaft timing performance is out of range.
Symptoms
- Rough idle
- Reduced power
- Check engine light
Common causes
- Sticking or faulty VANOS solenoid
- Dirty engine oil/clogged solenoid screen
- Low oil pressure
- Timing chain wear
Diagnostic steps
- Read VANOS actual vs target values
- Inspect and clean VANOS solenoid
- Check engine oil level and pressure
- Test VANOS unit operation
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29CC
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