obd II codes P050 and P051
 

have 03 v6 gt and check eng light came on-code p050=o2 sensor. got the o2 sensor and the after a few miles po51 came and replace that sensor. drove a few miles and p052 came on and i had already replaced that o2 sensor. can anybody help me with this???? could it be the aftermarket air intake on the car causing the problem???:(

100% the problem.

any advice on what i can do about the after market air box/intake? it want pass state inspection with the eng. light on. thanks for your help

Put the factory intake and air box back in.