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dtc p0131 is a heated oxygen sensor low voltage condition on sensor 1. This is caused by an extended lean condition. Look for damaged O2 sensor wiring,low fuel pressure,vacuum leaks, exhaust leaks, MAF sensor - disconnect MAF sensor to see if lean condition goes away, if so replace the MAF sensor, bad gas, poor pcm to engine block grounds, bad injector(s).
This info is from the park ave service manual (GM) hope it helps
Ed
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∙ 11y ago
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