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Old 01 Aug 2012, 06:20 pm
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Default code po420

Hi guys,today my check engine light came on I have a 2005 pt le non turbo the code is po420 which says catalyst system efficiency below threshold,does any body know what that is all about and how can I fix it.I dont notice any difference in how shes running.she runs pretty smooth,the only thing that is giving me trouble is that after shes warmed up (temp needle half way mark)and I shut it off,then like few minutes later start it back up she like runs really rough like she is going to stall,until i put it into gear and start driving and then shes fine,even if i stop at a red light,shes fine.Does that have anything to do with that code?Any help Please Thanks
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Old 01 Aug 2012, 06:48 pm
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Default Re: code po420

Maybe this will help:

Troubleshooting P0420 Catalyst Code
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