[DRW1000]

Yes,

Do a search under P171/174 or Isolator bolts in this forums. There are volumes of posts on this topic. Often it is not an O2 sensor failure. There is a TSB (technical service bulletin) for this failure in 99-03 models.

What most of us disover is that we have a leak in the intake system that is letting air into the intake stream that has obviously bypassed the MAF. This means that the PCM (computer) thinks there should be a specific amount of airflow and allows the correct amount of fuel into each port yet the O2 sensors read this as lean.

You only have 174 so perhaps you do have a different problem (even a bad O2 sensor) but my guess is that the leak is small and one sensor is a bit more sensitive or more "extra" air is getting to that bank. If I were a betting man I would bet that you will get code 171 soon too.

It is a bit of an involved job to repair but certainly not out of the range of many. Have a look at other posts and post back any questions. We are always willing to help and many of us have had this exact problem.