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Old 07-13-2012, 06:21 PM
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Unhappy code 0420

i had to replace a 02 last moth and sence than i put a new muffler on it and put new spark plugs in it buy on my way home to day i looked down and saw the engine lightbanghead:. i did the to code and i got the 0420.
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Old 07-18-2012, 12:46 PM   #2
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P0420 Catalyst system efficiency below threshold (bank 1)
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