Please I need an advice on a code P0155

I keep on getting p0155 and i know its the bank2, sensor 1, upstreams (driver side).
The light came back again this morning after 1 day getting my car back from him.
Im using bosh sensor 16318.. The car hesitate when the light gets on !
What am i doing wrong?
Thank you in advance!
Last edited by big_mike1979; Apr 10, 2015 at 10:08 AM.

At the end, he swapped the relays from left to right and vice versa and solved the prob so far.. i drove the car 140 miles today and nothing came on !
Im ASSUMING prob solved. (keeping my finger crossed )


Open the hood, and open the box of fuse and the box of the ecu.
if you look there is one single relay in each box that both r identical, swap em and see what happens. I hope it solves your issue!


