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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...