07 es350
I have a 2007 Lexus Es 350. My engine light along
with check vsc and traction control lights are on. I
put the car on a scanner and came back with code
P0138. (Bank1, sensor 2 oxygen sensor needed to
be changed) So I had the sensor changed and the
engine light, vac and traction control light went
off.. for 2 weeks. Now they're back on. I put the car
back on the scanner and I'm getting the same code
reading as before, bank 1sensor 2. Even though I
had that sensor replaced just 3 weeks ago. Do i
need to replace the left side upstream sensor now?
(The one i had replaced was leftside downstream)
What could be the problem?