1996 Chevrolet Corsica 02 sensor

Tiny
ARTHUR52
  • MEMBER
  • 1996 CHEVROLET CORSICA
  • 2.2L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 251,325 MILES
My Check Engine Light CAME ON CODE SHOWED DOWN STREAM 02 SENSOR LATE SWITCHING. I REPLACED BOTH 02 SENSORS. RESET CODE. TWO WEEKS LATER CHECK ENGINE CAME BACK ON. SHOWED LATE SWITCHING. NOW EVER 3 OR 4 DAYS I HAVE TO RESET CODE.I DID TAKE BOTH SENSORS BACK TO PARTS STORE THEY REPLACED THEM. BUT I STILL HAVE THE SAME TROUBLE. THANKS FOR ANY HELP. ART.
Friday, June 26th, 2015 AT 9:08 AM

1 Reply

Tiny
ED-WEEZY21
  • MECHANIC
  • 248 POSTS
Make sure you don't have any exhaust leaks. Even the smallest exhaust leaks will cause the oxygen sensors to act up. If you're 100% sure there isn't any exhaust leaks, it could be a bad PCM. I would take it to a professional to run further diagnostics.
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Friday, June 26th, 2015 AT 8:58 PM

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