P0420 trouble code


Old 07-17-09, 06:33 PM
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P0420 trouble code

Evening all.

I've got a 2005 toyota corolla that has a P0420 trouble code "catalytic converter below threshhold".

Anyone have an idea what the most likely problem might be and how to fix it?
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Old 07-17-09, 07:26 PM
Tolyn Ironhand's Avatar
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Hate to point you away from this site but I googled p0420 and clicked on the first link and got a great description.

OBD-II Trouble Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Old 07-26-09, 04:38 PM
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Ironhand is right on....95% of the time, it's time for a new catalytic converter
Old 07-27-09, 02:20 PM
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check warranty

Most cats have 8yr 80k warranty that is madated by the govt. Call your local dealership and find out if it is still covered. Must not be a salvage car or an aftermarket catalytic converter.
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