What does code P0301 mean on a BMW and is it safe to drive?
P0301: Cylinder 1 Misfire Detected. Here's what it means on your BMW, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The PCM has detected a misfire specifically on cylinder 1. Similar to P0300, but pinned to a single cylinder.
Common causes for your BMW
- Worn or fouled spark plug on cylinder 1
- Failing ignition coil or coil-on-plug
- Leaking or clogged fuel injector
- Low compression in cylinder 1
Symptoms
- Check Engine Light (often flashing when misfire is severe)
- Rough idle or shaking, especially at low RPM
- Loss of power under load
Typical fixes
- Replace spark plug and/or coil on cylinder 1
- Test and clean or replace the injector
- Perform compression test and repair internal issues if needed
Repair cost range
For a BMW, repairs for P0301 often fall between $150 and $900, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on BMW
BMW N54's high-pressure injectors can fail and cause cylinder-specific misfires. On the N54, cylinder 1 is at the front of the engine and its injector is the easiest to access. Confirm with cylinder contribution testing via ISTA before replacement.
Most commonly affected models
335i N54 2007–2013328i N52 2006–2013X3 N52 2006–2010