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Re: Downstream O2 Sensor Effects on Fuel Trim
Posted to Technical Theory Forum on 1/10/2019 6 Replies

G'day John, for years I was also under the impression that the Rear O2 sensor was just to monitor cat efficiency or a watchdog sensor so to speak, however, I have since found that on later vehicles it is indeed involved in fuel trim calculations.

I still don... Login to read more.

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