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Using the O2 Sensor to Diagnose Lean or Rich Cylinders
Posted to Technical Theory Forum on 2/1/2018 10 Replies

I've been putting my scope on everything lately, and ran into some odd O2 sensor waveforms on two of my cars. Basically, they both have below average fuel efficiency, and I noticed they both have very erratic O2 signals. Sometimes flatline lean, sometimes pegg... Login to read more.

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