2001 toyota corolla had PO420 code after checking car out everything looked good i put shell vpower gas in and within half a tank engine light went out and hasn't returned try it it might save you money and headaches #22 - sam - 01/08/2010 - 21:16catalyseur de ford freestar ...
Our check engine lights never returned. I have one sitting here ready to go Angle just like this I guess I better get it on and clear and see how well it does I know it did not work for my Corolla but that's an AC Delco computer car that ACDelco made grave firmware mistakes on ...
Before I do I'm going to try a set of upper and lower O2 sensors first and then I have something similar to this video but a little better made right here in the drawer and we'll see if that works that did not work on an '02 Corolla with the AC Delco computer problem that they...