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Service engine light will not illuminate when.

Tiny
ANONYMOUS
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 156 MILES
Service engine light will not illuminate when ignition is turned on for first start up. Has an O2 sensor bad also which should have it on. Have checked cluster and is good as led works. Checked wire from computer and is good also for continuity. Tried a used computer same thing. Any idea? If answer resolves my problem we can negotiate a fair contribution.
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Sunday, February 17th, 2013 AT 1:35 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Check all fuses for power to the pcm. Use a test light and check all fuses.

How do you know it needs a o2 sensor?

Never use a used pcm as it wont work. It is programed for another vehivle and will come up with vin mis match

Roy
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Sunday, February 17th, 2013 AT 2:46 PM

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