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Old 04-02-2019, 09:42 PM
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andrewwynn andrewwynn is offline
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Location: Racine, WI
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O2 can't range to negative values. The precat if reading negative values something is wrong. Looks like a case of problem sensor.

Also: post cat should gravitate to 0.45V so the 0.75 is very high but that can vary a lot.

What I would do: reset all the sensors by unplug them all, start the car run until you get multiple errors (probably missing O2 heater error) then plug them back in and clear the codes.

See if the numbers will come back into normal range (0.1 to 0.9v).

If you get values outside of normal you probably need to replace the sensor (use OE or OEM don't cheap out: I need to replace my knock off sensors)
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