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catalytic deficiency

641 views 1 reply 2 participants last post by  RalphP 
#1 ·
The smurf threw a cat deficiency code over the weekend, only 1 bank forget which side though. I've been data logging it lately to keep an eye on things.
I looked at both rear O2 sensor volts in the data from this mornings trip and they are at 0 volts the whole drive. I went back a month or so in my logs and voltage readings there look normal. The voltage form the front O2 sensors look normal also. I need to get under her and check wiring and look for any other obvious issues.

What's your thoughts? Both O2 sensors bad? They are probably original. Cats going bad?
 
#2 ·
I'd bet all FOUR O2s are going bad with age.

I'd plan on replacing all four of them, too.

RwP
 
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