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Re: P0420 diagnosis
Posted to Technical Theory Forum on 3/14/2010 17 Replies

Jeremy,

I see quite a few of these 420 codes. It is funny to me how many times people end up at our shop after another shop has replaced the O2 sensors and then send the customers down the road. On Thursday a single mom came in and the last guy had replaced ... Login to read more.

17 Replies Received (View Replies)