cat efficiency failure code please help?????
i have a 02 grand prix se withthe 3100. the engine light comes on and when i had it check it came up as cat converter efficiency failure. so i put new new o2 sensors and a new cat. a week later it was back on. i had it erased anda week later came back on same code. it has been like this for about 3 months. meanwhile i went from 30 mph to 23 and it stays at 23. cant figure out what is going on. also i had the egr replaced. anyone know what is going on.
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