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Showing results for tags 'p0420 code'.
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i have just finished rebuilding and installing new heads on my 99 forester s.o.h.c 2.5 because it had a bad miss after a timing belt change found 4 bent exhaust valves the car ran with these 4 bent valves for 40,000 plus miles.After the job was finshed the car ran like new,then 3-4 days later the C.E.L. comes on.So off to the parts store to use there scanner to check the code its p0420 catalytic converter below threshold bank 1 the same side of the engine i had the 4 bent valves.Ive read so much about this code its makin me crazy Id like to start simple and move my way foward to fix it hoping i didnt ruin the converter driving the car that long with the engine misfiring and after a lot of money into rebuilding the heads i dont want to ruin anything else by ignoring the code other than the code it runs great but i think the gas mileage could be better