P0300 code
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Intermediate
Joined: Mar 2024
Posts: 29
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P0300 code
I put some ngl plugs in about 2 months ago then it started saying “service charging system” which was weird then about a week after I got a misfire code p0300 so I pulled the plugs and all the passenger side plugs where burnt black but the driver side plugs where fine.so I replaced the plugs with good quality plugs and still have a p0300 what else could it be ?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
OK, you asked…it could be plug wires, coil pack, coil pack wiring, clogged injector, defective injector, injector wiring,bad O2 sensor, bad O2 sensor wiring, broken valve spring, sticking valve, burned valve, wiped cam lobe, faulty fuel pump, faulty crank sensor, faulty MAF sensor and a few others I may have missed for this random misfire…without the proper diagnostic equipment and knowledge to see exactly which cylinder or cylinders that are misfiring you should take the car to a diagnostic shop…they will find the ONE part that is bad…this is not a blown fuse…other than changing plugs and wires diagnosing misfires are beyond the capabilities of most DIY’ers.
Last edited by C5 Diag; Sep 18, 2024 at 10:14 AM.
