2003 Buick LeSabre

Question

Codes are p0300 p0301 p0171 p0128 changed plugs and wires and thermostat. Still getting these codes and engine light flashing. Help please

Answer 1

P0300 Random misifire'

P0301 Misfire number 1 cylinder

P0128 Thermostat below regulating temperature

P0171 fuel trim lean Bank 1

Anytime the CK ENG LT flash this is ignition related, a bad fuel injector that is non operation can not make the CK ENG LT flash only a ignition related event. such as a sparkplug wire ignition shorting to ground or a bad sparkplug secondary shorting to ground. You may have to replace one of the igntion coil.