Is the diagnosis the same for all cylinder misfires?

Yes — P0301 through P0308 are diagnosed the same way. Swap components to the affected cylinder to isolate the cause.

What if the misfire does not follow the coil or plug?

Then the issue is specific to the cylinder — check injector, compression, or valve timing on that cylinder.

High Severity

Ignition System

Cylinder 2 is misfiring.

Common Fix

Replace spark plug or coil

Estimated Cost (DIY)

$5 - $80

Bad spark pluglikely

Faulty ignition coillikely

Bad injectorpossible

Low compressionpossible

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Is the diagnosis the same for all cylinder misfires?: Yes — P0301 through P0308 are diagnosed the same way. Swap components to the affected cylinder to isolate the cause.
What if the misfire does not follow the coil or plug?: Then the issue is specific to the cylinder — check injector, compression, or valve timing on that cylinder.

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