回复：[更新] 新手DIY - engine random misfire

code of P0300

Possible problem:

- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressur

Read more: http://helpforcars.net/obd_codes/p0300_toyota.html#ixzz2RxZRclhI