My engine light came ON, and when I checked for codes, I pulled all these codes P0300, P0301, P0302, P0303, P0304, and P1399. This is a lot of codes, where do I start?
P0300 Random misfire
P0301 Misfire number 1 cylinder
P0302 Misfire number 2 cylinder
P0303 Misfire number 3 cylinder
P0304 Misfire number 4 cylinder
P1399 Random misfire
Where to start to clear the code, you may just have one cylinder causing the whole cylinder to misfire. Clear the code and retest the vehicle and check for codes,
On this Honda Civic a P0300 with all 4 cylinders having a misfire code condition. the fault here was the distributor rotor moved out of position, the fix was the cap and rotor
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