I had poured a gallon of lacquer thinner from Home Depot into a half tank of Shell premium gas in my 2004 Xterra. I drove down to San Diego at a constant speed of 65 m/h for one and a half hour. Unfortunately my P0430 Servise light did not go off. But added three more codes; P0420 pending Bank1, P0420 pending bank1, and P0430 pending bank 2. So now all four catalytic converters on this car are infected. I have about 160,000 miles on this car. May be it is time to change all of the converters. I tried this cheap fix and apparently not working at all.