Thread: p0420 02 gtp

i suppose it could..... it seems kinda coincidental that out of all the codes a bad o2 sensor could throw, its throwing the exact one that we already have an explanation for ....
if your downstream sensor is indeed bad and you put a new one on, you'll most likely get that code again since your new good sensor will be picking up that your magnaflow cat isnt doing a great job, like zzp said