Oxygen sensors
 

I had a cel for o2 sensors on my truck. Changed them and cleared the code and the light does not come back but my mileage has gone to crap. What can I do?

Lots of reasons you can get an O2 sensor related code besides just the sensor being bad. The code could of been indicating some other issue with the truck such as it running rich.

What was the actual code that came on?

How long have you ran the truck since changing the sensors?

I don't remember the specific but it was something about a heated oxygen sensor. I changed them a week ago.