Porsche 911 Maintenance Service

Porsche 911 technical FAQ

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OBD: P0300 ×
What does fault code P0300 mean and how should it be diagnosed?

Validated technical answer

P0300 indicates random or multiple-cylinder misfires. First read all stored and pending codes and the freeze-frame data. Inspect the spark plugs, ignition coils, connectors and wiring, then check for intake-air leaks, fuel-pressure problems, injector faults and low cylinder compression. Avoid sustained driving while the warning light is flashing because unburned fuel can damage the catalytic converters.