1997 Chevy Blazer SERVICE ENGINE SOON LIGHT

Tiny
THEWEINIE
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 98,370 MILES
I HAVE A 1997 BLAZER 4.3 WITH 98370 MILES. THE SERVICE ENGINE SOON LIGHT IS ON. IT TELLS ME CODE 155. I CHANGE THE O2 SENSOR BEHIND THE CAT. I CLEARED THE CODE AND DROVE AROUND PUTTING ABOUT 75 MILES ON THE CAR. THE SERVICE ENGINE SOON LIGHT CAME BACK ON. AGAIN CODE 155. WHAT OTHER PROBLEMS COULD THIS BE, I REALLY DOUBT THAT IT IS THE O2 SENSOR ANYMORE. THANKS FOR YOUR HELP
Friday, February 1st, 2008 AT 5:12 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
155 is pre-cat o2. First sensor on bank 2 *side opposite of the #1 spark plug* replace the sensor before the converter.
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Friday, February 1st, 2008 AT 7:12 PM

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