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P0303 : misfire cylinder #3
Was an intake manifold gasket for me.
Cylinder #1 misfire.
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In the past I have had an engine misfire due to a bad fuel injector. hope this helps.
Could be a bad ignition coil each cylinder has its own
po301 means cylinder 1 misfire
code p0302 is cylinder no.2 misfire detected
p0308 is a cylinder 8 misfire , can be several reasons why
Its a misfire detected on cylinder No. 2
Trouble code P0301 means: Cylinder 1 Misfire Detected
Trouble code P0302 means: Cylinder 2 Misfire Detected