what is the root problem of code P0300

Question

I keep getting an engine code of P0300 from my 2003 Nissan pathfinder, I tested the coils they are good I checked for power at the injectors I dropped the exhaust and there is nothing coming out, before going and spending a boat load of money on new catalytic converters I would drill through them but nothing changed. I am lost. help

Answer 1

Hi there,

First, testing the coils is usually not an effective test. The resistance readings can change as the coils heat up and cool down. That being said, it could be an issue with the coils themselves or even an intake leak or mass air flow sensor issue.Low fuel pressure is also a common cause for this code.