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title=Misfire Code Helper meta_title=Misfire Code Helper description=Decode misfire trouble codes and map cylinders using common numbering layouts. canonical=https://troubleshootyourvehicle.com/tools/misfire-code-helper >

Misfire Code Helper

Decode Your Misfire Code

Codes P0301-P0312 identify a specific cylinder. P0300 is random misfire.

Quick Notes

  • Cylinder 1: Usually closest to the front of the engine (belt side).
  • Bank 1: The side of the engine that contains cylinder 1.
  • Verify numbering: Always confirm with a service manual or under-hood label.