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Bad cat or bad rear O2 (if you are into throwing parts at it, replace the O2 first).... Or just get a O2 simulator for the rear O2. It will never set a P0420 or P0430 again.
160k is around when my rear O2 heater failed. Don't care about rear O2....
Originally Posted by islexusred
98 gs400 with 160k+ still pushing hard... only if i can rid of the P0430 code...
1998 GS400 with 272,850 miles. I've had the car for 8 years, bought it with 87K miles on it, and everyone said I was crazy to pay so much for a car with 87K miles. I would do it all over again in a heartbeat. I replaced the MBC at 250,000 miles and it drives even better than new now with the upgraded 2001 MBC. I love this car!