P0133- Aging of O2 sensor ahead of the three way cat on Bank 1
P1276 - Aging of O2 sensor ahead of three way cat on Bank 2
It is unusual for two forward sensors to age fail at the same time. I would clear the codes with the Durametric and see if they return before replacing anything.
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Last edited by JFP in PA; 07-03-2020 at 08:36 AM.
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