ford focus fault code P0420
21-01-2011, 05:48 PM
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ford focus fault code P0420
catalyst system low efficiency what do i need to do to repaire this problem all help welcome
21-01-2011, 05:57 PM
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ST170 by any chance?
It's the pre cat lambda sensor that needs changing.
22-01-2011, 05:19 PM
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if its an rs running a decat then this can cause that fault.....just have to clear it every now and again
22-01-2011, 05:55 PM
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that codes saying it thinks the cat is fucked.
do you have a cat? with a cheater?
could also be the post cat sensor faulty.
22-01-2011, 06:18 PM
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is the code cat effinency below threshold if so more than likely cat you need to ckeck the lamba s if they are switching the same your cat up the swaney
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