Oxygen sensor response too slow

[Webster]

This is the message I got on my 2002 with 47,000 what should I do.

 

[2003KJ]

Is it telling you which oxygen sensor is responding too slowly? There is two on the KJ (upstream and downstream). Did you get the extended warranty?

 

[priell3]

This is the message I got on my 2002 with 47,000 what should I do.

Code P0139? That's what I had, the dealership flashed the computer.