P0301high severityPowertrain
Cylinder 1 Misfire Detected
on 2010 BMW M3 E90 4.0L V8 S65 · RWD
What this code means
The PCM has detected a misfire condition specifically in cylinder 1.
Symptoms
- Check Engine Light
- Rough idle
- Vibration
- Loss of power
- Fuel smell from exhaust
- Poor fuel economy
Common causes
- Worn or fouled spark plug #1
- Faulty ignition coil #1
- Damaged spark plug wire
- Faulty fuel injector #1
- Low compression cylinder 1
- Vacuum leak near cylinder 1
Diagnostic steps
- Swap ignition coil #1 with another cylinder to see if misfire follows
- Inspect spark plug #1
- Test fuel injector #1
- Check compression cylinder 1
- Check for vacuum leaks near cylinder 1
Repair notes
Try swapping coil first. If misfire follows the coil, replace it. If not, check plug, injector, then compression.
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Other Powertrain codes on this vehicle
29CC
Misfire Cylinder 1
29CD
Misfire Cylinder 2
29CE
Misfire Cylinder 3
29CF
Misfire Cylinder 4
29D0
Misfire Cylinder 5
29D1
Misfire Cylinder 6
29D2
Misfire Cylinder 7
29E0
Lambda Additive/Idle Adaptation Limit, Bank 1
29E1
Lambda Additive/Idle Adaptation Limit, Bank 2
29E2
Lambda Multiplicative Part-Load Adaptation Limit, Bank 1