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Re: Using the O2 Sensor to Diagnose Lean or Rich Cylinders
Posted to Technical Theory Forum on 2/1/2018 3 Replies

There are some vehicles that use the front Heated Oxygen Sensor to monitor individual cylinders for a fuel trim imbalance.

Here is an OBDII fault code for it: [...] [[...]]

"...the cylinder imbalance detection monitor matches up the upstream O2 sensor sign... Login to read more.

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