OBD2 Codes

P0303 – Cylinder 3 Misfire Detected

Cylinder 3 is misfiring; check spark plug coil and injector.

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Details

Specific cylinder misfire. Swap coil with another cylinder to test if problem follows the coil.

Typical causesBad spark plug failed ignition coil clogged fuel injector weak compression
SymptomsRough idle loss of power check engine light flashing
SeverityHigh — can damage catalytic converter
DIY checksSwap ignition coil with another cylinder to test if problem follows coil
ToolsSpark plug tester coil tester compression tester

Utilities

Copy-paste helpers

Quick checklist

Swap ignition coil with another cylinder to test if problem follows coil

FAQ

Common questions

Can I drive with a misfire?

Not recommended—unburned fuel can damage the catalytic converter.