While I am asking about the primary o2 sensor problem, I thought I would just throw out another question! I recently purchased a high-flow cat and the bung hole for the secondary o2 sensor was relocated from the original location near the rear of the cat to the front of the cat!!! I was not able to extend the wires so that I would not risk damaging the secondary sensor. I plugged the hole and got resistors so that the computer would be fooled...I have had the cat for about 2 weeks...checked the error code again yesterday and it is still not throwing a secondary o2 sensor code... I guess I am worried that it may throw a code 67 (bad cat)...Should I have the new hole welded and have a new hole drilled??