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  CEL misfire codes I have a 03 civic hybrid with an intermittent CEL issue It is giving me P0300 and P0301,02,03, 04 etc all misfires Occurs at low RPM No other DTC's given When I clear the system, it is fine for a bit then the CEL comes back on I've checked fuel pressure per the Honda service manual, it has 40 PSI pressure  P0301 HONDA code tech notes The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 1 If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"The Honda Civic Hybrid is a variation of the Honda Civic with a hybrid electric powertrainHonda introduced the Civic Hybrid in Japan in December 01 and discontinued it in 15 In the United States, it was the first hybrid automobile to be certified as an Advanced Technology Partial ZeroEmissions Vehicle from the California Air Resourc