Just replaced bank 2 sensor 2 on my pickup and today the engine light comes on a on 2004 Chevrolet Silverado 1500

nd says that the 02 sensor bank 1 sensor 1 needs to be replaced. Where is this sensor located please?

3 answers 3 comments
Drivers side front sensor. That is the answer to your question not your trouble code.
code number never identifies a bad part just a failed system. get it checked to be sure.

Roy
trouble code says bank 1 running too lean
Check for vacuum leak on left (drivers side) of engine. Is eng. running ok.
Smooth idle?
Running fine.
agree with master tech only the circuit has issue not necess the sensor