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Old 02-01-2013, 02:56 AM   Thread Starter #1
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Default P420 Code

Hello all I am fairly new to this site and I am having some problems with my 05max se. The code p420 popped on about 78k . It was a faluty converter in back 1 luckily I was still under warranty for this problem to be fixed for free. Now my car is at 94k and the same code is popping up I took the car to autozone and they printed a list of things that it could be . A large vaccum leak,ignition system fault, fuel system fault or converter. Seeing how this exact converter was replaced by the dealer . I would like to think that it is not the converter . Please help I'm at my whits in

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Old 02-01-2013, 03:15 AM   #2
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Default Re: P420 code

Try this


Some will obviously advise you not too. I was running this code and kept clearing it. Came across this, tried it and haven't had the code since!
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Old 02-01-2013, 03:25 AM   Thread Starter #3
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Default Re: P420 code

Ok so just out of curiousity this won't mess anything up will it?
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Old 02-01-2013, 03:39 AM   #4
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Default Re: P420 code

Hasn't messed up anything on mine. And if you read the comments its worked for a number if other people as well. He's been doing it for 30 years. Its up to you., it worked for me thank goodness couldn't afford new pre cats
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Old 02-01-2013, 03:53 AM   Thread Starter #5
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Default Re: P420 code

Ok now how hard is it to remove the cat
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