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CEL with P0446 & P1420

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HELP!!

 

I've found out what the codes mean, but what part needs to be tested/replaced? Haynes manual is no real help with this either. I did find a little info about P0446 on this forum. A web search gives several list of what the codes mean but how do you find what part the codes relate to.

 

Using the OBDII adapter from http://obddiagnostics.com/

 

Thanks,

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