Smog test: Vehicle failed the MIL/Check Engine Light due to failure to successfully complete all OBD self tests
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From: Jeff Strickland on 15 May 2010 20:33 "jim" <"sjedgingN0Sp"@m(a)mwt.net> wrote in message news:hsmdne6ssO0PqHLWnZ2dnUVZ_hWdnZ2d(a)bright.net... > > > Jeff Strickland wrote: > >> "jim" <"sjedgingN0Sp"@m(a)mwt,net> wrote in message >> news:9tqdnSdsatigMHPWnZ2dnUVZ_v6dnZ2d(a)bright.net... >> > >> > >> > Jeff Strickland wrote: >> > >> >> Bottom line is, >> >> you either have a bad CAT or a bad sensor. >> > >> > Not necessarily. Exhaust leaks and corroded electrical connection are >> > also possible causes of P0420 DTC. >> > >> >> Yeah, sure. Out here in California, we don't have much trouble with stuff >> corroding, but we all know it happens. > > Maybe he's not in Cal. > > He said in his original post that he's in California. >> >> >> Seems to me that one would hear an exhaust leak large enough to cause a >> code >> that says the CAT was bad. > > I have no way of knowing if he hears an exhaust leak or not. A small leak > in the > right location would be enough. > Yeah, I don't know that either, but it seems that one would hear an exhaust leak. I think the problem is that the CAT is below efficiency, which would tend to mean the exhaust is rich -- it contains to much gas -- and I can't quite figure out how a leak would make that happen. But, another thing to look at before pulling out the checkbook is always good. |