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Go Back   3800Pro.com Forum > Engine > DTC's, Problems & Troubleshooting

DTC's, Problems & Troubleshooting Getting an engine related DTC? Check here for assistance.

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Old 05-07-2009, 07:37 PM
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p0420 code help

i have a 2004 impala ss that keeps throwing the p0420 code which is the catalyst efficiency code. I tried running some fuel cleaner through and clearing the code but it keeps coming on. I dont know if the catalytic converter is bad or what.....any ideas please help

thanks
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