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Front Upstream O2 Sensor Low Voltage
My front upstream O2 sensor that came with the car died, I think it was even factory. Came with the codes PO131 and PO171, and also worse MPG. With my somewhat fancy scan tool, I was able to see that both fuel trim levels were stuck on 1 number and never changed. I bought a Denso O2 sensor and...- TornadoThrower
- Thread
- o2 sensor upstream w-body
- Replies: 3
- Forum: Buick Regal Forum (Pre-2011)
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