Playing/learning a new Ultragauge and although the car is running fine these two trouble codes came up in the 04. No check engine light. Mileage is also good. Thinking I should change the 02 sensors. Car has 134,000 miles so it would not be unheard of.

 

First, I'd clear the codes and then see if they return. There are unique circumstances that will cause these 2 codes so drive and check later.

 

Interesting, I cannot clear the codes by resetting the check engine light since it is already off. I suppose I could disconnect the battery, but would have to input the navi/radio codes. I will monitor the O2 voltages a bit and see if i can determine what is setting the TC alarm on the Ultragauge.