My car had the following problems: surging, pinging around 2500-3000rpm's, hesitation, loss of HP. I knew my o2 sensors needed to be changed because I ran the codes on them (176, 172) if I remember correctly, lean in bank #1 & 2. I disconnected the negative battery (30min) cable in order to reset the computer and changed them out. It seems that I cured all my problems except the hesitation. I feel a lot of hesitation when I step on the accelarator. It is like the car is choking. And the Check Engine Light is still coming on. Do I need just allow more time for the computer to adjust to the new sensor or is there something else wrong? Any ideas?