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International Automotive Technicians Network
Re: p0420/p0430
Posted to Technical Discussion Forum on 4/28/2023 1 Reply

What does "O2 waveform very good" look like? "Good" is not a very useful descriptor for diagnostics.

My P0420 checklist:

NO exhaust leaks, not even a pinhole near - upstream of the S2 sensors.

Fueltrims 0 +/-5%, O2 and AFR can read "full range".

NO mis... Login to read more.

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