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1996 SATURN P0420 CODE

I ASKED THE QUESTION ABOUT MY 1996 SATURN AND YOU JUSST REPLIED ASKING ME A BUNCH OF QUESTIONS...
THE CODE IS P0420
YES, THE CHCK ENGINE LIGHT IS ON

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Ok knowing the code is what its all about..- code 0420 is
"Catalyst efficiency below threshold"
This indicates that the oxgygen sensor downstream from the cat is sensing high levels of oxygen after the cat. The catalyst is supposed to use all the oxygen to catalyse the nasty **** in your exhaust. A high level downstream from the cat indicates either the cat needs to be replace (MOST LIKELY) or you have a faulty sensor.
A faulty sensor would bring up other codes on your scan too, so I am afraid a new Catalyst is likely the fix. They last about 120-150K miles so if you're in that range there ya go....
hope that gets it for you...pls rate me if you get a mo.

Posted on Jan 11, 2009

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Catalyst System Low Efficiency (Bank 1)
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