29CFhigh severityPowertrain
Misfire Cylinder 4
on 2013 BMW X1 2.0L N20 turbocharged I4, 240 hp · AWD
What this code means
The engine control module detected a misfire on cylinder 4, indicating a combustion problem in that cylinder. This is the BMW equivalent of OBD code P0304.
Symptoms
- Rough idle
- Reduced power
- Check engine light flashing
Common causes
- Faulty ignition coil
- Worn spark plug
- Fuel injector fault
- Low compression or vacuum leak
Diagnostic steps
- Read freeze frame and confirm cylinder 4 misfire
- Swap coil and plug to another cylinder
- Test injector operation on cylinder 4
- Perform compression test on cylinder 4
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Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
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Serious DIY~$100
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Autel MaxiCOM MK808S →
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Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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