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Code 13, engine is sputtering and barely running?

Tiny
CHEVYMETAL1991
  • MEMBER
  • 1991 CHEVROLET BLAZER
I Have the vehicle listed above k5 (v10 4x4) blazer mileage 202,636 with a manual transmission. Last night it I started running really badly, it's sputtering and barely running. I ran the error code and it's coming up code 13 which is o2 sensor circuit open. I replaced the o2 sensor, but it still didn't help.
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Wednesday, June 6th, 2007 AT 12:42 PM

2 Replies

Tiny
BACKYARDMECHANIC
  • MECHANIC
  • 337 POSTS
If you are still getting the same code, then I would check the wiring/harness to the O2 sensor. If the O2 sensor wasn't bad/open, then it is probably the wiring.
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Wednesday, June 6th, 2007 AT 12:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Open wiring is the only thing that can cause this code or a bad ECM.
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Tuesday, December 19th, 2023 AT 6:47 PM

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