1996 Chevrolet Corsica 02 sensor

1996 CHEVROLET CORSICA
251,325 MILES • 2.2L • 4 CYL • FWD • AUTOMATIC
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ARTHUR52
  • MEMBER
  • 2 POSTS
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.
Jun 26, 2015 at 9:08 AM
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ED-WEEZY21
  • ASE Certified Mechanic
  • 248 POSTS
  • ASE Certified Mechanic
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.
Jun 26, 2015 at 8:58 PM
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