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Old 09-08-2020, 04:47 PM   #21
blue62
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Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Actually I believe I was wrong about the post cat O2 sensor voltage that I posted previously.

If the cat is working properly then it is using up all the oxygen in the catalytic process.
Therefore the post O2sensor should show a relatively flat high voltage reading.
This is fully warmed up and RPM held steady around 2000 RPM.
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