P0140 and P0138 Need help

Tagged: 02 sensor

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January 10, 2025 at 10:40 am #307992
Leonard707
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P0140- Heated oxygen sensor circuit insufficient activity sensor 2- Brand new AC Delco installed

P0138- Heated oxygen sensor circuit high voltage sensor 2

Pcv was leaking I replaced valve cover with integrated pcv, cleaned MAF, replaced MAP sensor, cleaned throttle body. I had a bunch of other codes that have been eliminated with parts I’ve replaced

This is a 2014 Chevy volt. Has anyone heard you have to calibrate or re learn the 02 sensors?
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