[Hoags]

Hey Guys, I got my son an 02 Eclipse with a 3.0L auto Trans. The car has about 160K on it. A buddy and I recently changed the transmission while doing that we replaced the exhaust pipe containing the cat. converts. because of the check engine light was on. After changing that pipe the light stayed on, the codes indicated that we had a problem with the O2 sensors on Bank 2....I changed both sensor 1 & 2 on the rear bank, the CEL stayed out for 2 days, now I am getting codes indicating Bank 1 sensor 1 (we have also changed bank 1 sensor 2) I have replaced the O2 sensor with a Bosch Direct Fit (not using the universal O2 sensors) and still have the codes indicating Bank 1 Sensor 1. Could we have gotten a bad O2 sensor (I wouldn't think that would be a common issue) or is there something else that I should be looking for? Ironically, my buddy and I are have a very similar issue with a 1998 Eclipse with the 2.0L Turbo that we are trying to help another buddy fix. Any thoughts or any input from you guy's would be greatly appreciated. My son's Eclipse has not had any engine modifications done, all factory and/or direct replacement parts have been used when repairing the car. We did change the timing belt about 10,000 miles ago.
Thanks in advance for any help with this matter.