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2000 Sable code P0420
This car has had the CE light on and off for a while. I been chasing symptoms a few months.
A few weeks ago we had a code pointing to the O2 behind the cat as bad. I had it replaced and no CE light for about 3 weeks.
Now I have the dreaded P0420 bad catalyst code. Before I go and change the cat is there anything else could be causing this code?
The car has to be NYS inspected by the end of the month so I do need to clear this up soon.
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