hey, all!
I have a 97 disc that the OBD II send me the code p0130, bank 1, sensor 1. I think my dealer have changed all the sensors on my car last week, however, he is not really trustable,. so anyone know where in the truck i can see if the sensor has been changed? ---- a pic would be best, but thank you all anyway!!

nic
ps, the car has 166k on it!

 

You would know if he changed all 4 O2 sensors last week, at about $600 for the job.
If he did, then take it back and have him check and replace it under warranty.
Mike