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P0300 and P0141 error

Tiny
PLMCGUIR
  • MEMBER
  • 2003 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 85,000 MILES
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?
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Monday, May 30th, 2011 AT 6:30 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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.
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Monday, May 30th, 2011 AT 8:04 PM

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