Here are the details.

Wrench light on
Check engine light
PO137 bank1 sensor 2
A1 15% oil life

When driving down the road it seems to act fine under 50 mph. Once you get above 50-60mph and then let off the gas to coast, it seems to be a discrepancy between the rpm's and the sound from the motor or transmission. It sounds as if it is tacking at 4-5k but registers about 1500 rpm's. I don't know why. Could this be in conjunction with the po137 code or do we have 2 different problems at the same time?

Any help you can offer would go along way.

Thanks
Daniel