code 420... dealer replaced the o2 sensor drove the car roughly 100 miles since then CEL is on again gonna go to autozone and get the code checked and i'll post it hear... is there any chance that this could be the dealer screwing up and not replacing the right parts? this is my third time returning this car since i've had it (3 weeks) not a good pattern... i'm starting to second guess my purchase

#3162 of 6535 98 SVT Silver frost Viper Responder 791 w/ 2way remote start Let the modding begin!