Ok I was having a p1077 and cat monitor was the only monitor not ready, and I replaced the intake manifold and now all monitors are ready but I'm getting a p0420 MIL is on , I scanned using ob2 scanner and I'm reading v current for o2 sensor bank 1 sensor 1 and its reading 0.640-0.665 and the 02 sensor bank 1 sensor 2 numbers are just going crazy, what should my problem be any help I would really appreciate ate it .
Do I have bad o2 sensors I need help
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