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Diagnostic Code P0420

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Old 05-03-2008, 09:05 AM
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Diagnostic Code P0420
My car has the SEL and the code is P0420.After researching I found that it means that the "catalyst efficiency low-bank 1".So what should I check first the fix the problem?
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Old 05-03-2008, 12:09 PM
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why do you have two threads about this

check your other thread for my answer...and next time...search
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