Wypadanie zapłonów — cylinder 4
P0300B
WysokiRandom misfire — BMW diagnostics (N20/N54/N55/B48)
OBD-II (EN): Random Misfire Detected (BMW N20/N54/N55/B48)
Code P0300B — Random misfire — BMW diagnostics (N20/N54/N55/B48). Symptoms: jerking. Possible cause: faulty ignition coils (common N54 defect — coils after 60-80k km). Professional diagnosis recommended.
Symptoms
Jerking, vibrations, flashing check engine light
Possible causes
Faulty ignition coils (common N54 defect — coils after 60-80k km), worn or dirty high-pressure injector (N54/N63), faulty high-pressure fuel pump HPFP (N54)
Affected systems
Related codes
Zapłon niewłaściwy — cylinder 5
Zapłon niewłaściwy — cylinder 6
Wypadanie zapłonów — cylinder 2
Wypadanie zapłonów — cylinder 1
Wypadanie zapłonów — cylinder 3
Universal version
This code has a universal OBD-II form:
P0300Wykryto losowe zapłony w wielu cylindrachCode P0300B appears in these brands
Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.
Does code P0300B require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.
