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Discussion Starter #1
I posted before and only got one reply and really no help. I have a 2003 Elantra that throws code p0420. My question is could It be something simple or is it for sure the cat. If it is the cat, I assume it is the one that is under the car and not the one on front of the engine. Really could use some advice, my dmv pass expires in a couple weeks. The funny thing is that the car blew clean air out the pipe but failed smog because the sensors were not reset from me clearing the cel.
Thanks
 
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