Maintenance oil changes, what fluids, tires etc...ask your general manitenance questions in here or look up the answer before you post.

po420

Old 08-Sep-2011, 09:46 PM
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po420

could a bad fuel filter cause code p0420 catalytic efficiency below threshhold.has anyone dealt with this without changing the cat,i have a 2000 sir the light came on today,cleared it back in a few hours.
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Old 08-Sep-2011, 10:03 PM
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Could be a toasted primary or secondary O2 sensor. The stock cats last a long time. Should have a shop run a diagnostic with a proper scan tool to see if both O2 sensors are working correctly. If so, then it's the cat that needs replacing.

Not a bad idea to do the fuel filter if you haven't done it in a while, but it's unlikely it would cause that code to show up.
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Old 09-Sep-2011, 09:46 PM
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p0420

thanks had it checked out needs an o2 .not that bad thanks for your help.
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