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P0301 Diagnostic Trouble Code Discussion for September 2021

Cylinder 1 Misfire Detected

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Trouble Ticket Help Requests for DTC P0301
Help Request Posted
2002 Ford F-150 XL 4.2L Misfire VIN: 1FTRF17292
P0301: Cylinder 1 misfire detected. Light intermittent misfire on Cylinder 1 according to cylinder contribution test data. Misfire can be felt at idle, but not while driving. Bank 1 O2 sensor is reading rich and bank 1 fuel trims are -20. Bank 2 fuel trims are +/-5. Compression testing shows...
September 13, 2021
2008 Mitsubishi Lancer GTS 2.0L Misfire VIN: JA3AU86U98
P0301: . hi I am having problem with this one it has a misfire only under load at about 80 km/h. The car had a aftermarket air intake with a dirty air filter i replaced it with a factory air box with a new air filter.The spark plug were worn i replaced them with ne...
September 13, 2021
2014 Mazda 3 i Grand Touring 2.0L Poor Idle Quality VIN: JM1BM1M73E
P0301: . ... regular oil change. Air filter was dirty and my Tech recommended a EFI cleaning which we did. When the customer left he felt a rough idle and he brought it back, we reset the code P0300, P0301. He drove it couple of days hopping idle will relearn but i...
September 17, 2021