P0300 and P0141 error

2003 CHEVROLET CAVALIER
85,000 MILES • 4 CYL • FWD • AUTOMATIC
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PLMCGUIR
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  • 1 POST
I have a 03 chevy cavalier. It randomly will begin misfiring (thus the P0300). other times it runs fine. I replaced the plugs, boots to the plugs, the fuel filter, and even the ICM. sometimes it runs like a champ. then it will begin misfiring, and i can't make it across an intersection! next morning, it will run like a champ again! I was assuming the P0141 was a result of the misfiring. could it be sending bad info the the computer, and thus causing the problems?
May 30, 2011 at 6:30 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
The PO141 is an 0/2 heater code. The circuit needs to be tested to determine if it's the fuse, the wiring or the sensor at fault. The misfire is going to be something else, could be a crack in a coil or a plug.
May 30, 2011 at 8:04 PM
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