What does code P0305 mean on a BMW and is it safe to drive?
P0305: Cylinder 5 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
Misfire on cylinder 5—present on V6, V8, and inline-5 engines only. On V6 engines, cylinder 5 is sometimes harder to access; factor labor into repair estimates.
Common causes for your BMW
- Fouled spark plug
- Failed ignition coil
- Leaking or clogged injector
- Low compression from valve or ring wear
Symptoms
- Check Engine Light
- Engine shaking or rough idle
- Power loss under acceleration
Typical fixes
- Replace spark plug and coil on cylinder 5
- Test and replace injector if needed
- Compression and leak-down test
Repair cost range
For a BMW, repairs for P0305 often fall between $150 and $1000, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on BMW
BMW inline-six P0305 near the rear of the engine. N54 P0305 most likely indicates an injector contribution issue—check with ISTA. N55 engines tend toward coil or plug failures more than injector issues.
Most commonly affected models
535i N54 2008–2010535i N55 2011–2016740i N54 2009–2011