P0300

P0300 — Random/Multiple Cylinder Misfire Detected

Random/Multiple Cylinder Misfire Detected

High risk Powertrain OBD2
7 High
Can you drive? With caution
Response In 1–2 days

What does P0300 mean?

The engine control module (DME) has detected that more than one cylinder is not firing correctly, causing the engine to run rough. This is a general misfire code, indicating a problem that isn't isolated to a single cylinder.

Symptoms

Check Engine light is on

Common causes

1
Worn or faulty spark plugs
2
Failing ignition coils
3
Vacuum leak from intake manifold gaskets or hoses
4
Low fuel pressure or clogged fuel injectors
5
Faulty Mass Air Flow (MAF) sensor
6
BMW Specific: Issues with the VANOS system or DISA valve

What the workshop should check

01
Inspect and replace spark plugs and ignition coils as needed.
02
Check the intake system for vacuum leaks, paying attention to hoses and gaskets.
03
Measure fuel pressure and inspect the fuel filter.
04
Clean or test the Mass Air Flow (MAF) sensor.
05
Check the crankshaft position sensor for faults.

P0300 by vehicle make

The engine control module (DME) has detected that more than one cylinder is not firing correctly, causing the engine to run rough. This is a general misfire code, indicating a problem that isn't isolated to a single cylinder.

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