Code 13, engine is sputtering and barely running?

1991 CHEVROLET BLAZER
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CHEVYMETAL1991
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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.
Jun 6, 2007 at 12:42 PM
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BACKYARDMECHANIC
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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.
Jun 6, 2007 at 12:46 PM
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STRAILER
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Open wiring is the only thing that can cause this code or a bad ECM.
Dec 19, 2023 at 6:47 PM
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