since it was nice out yesterday i took some time during lunch and changed my fuel filter and pcv valve. when i was leaving work the check engine light came on, pulled the codes and came up with four of them, p0135, p0155, p0155, p0161 all relating to heater circuit for oxygen sensors. one of the sensors was replaced about 30K then rest are still the oe ones with about 93k on them. i found it very odd that they would all come up at once.car runs great, milage is good, (about 18-20 trips trips <5miles, about 26-29 all highway). just looking for any input or if there was something i could have screwed up when changing either pcv or fuel filter. i dont really feel like spending $400 on o2 sensors thanks

 

Check the O2 sensor fuse - its in the fuse panel inside the car (under the steering column).

 

i think thats what it might be, i wanted to pull the fuel pump fuse and i think i might have accidently pulled the o2 sensor one and somehow put it in the wrong slot ill reset the cel tomar and see it that takes care of it, it def makes more sense than all 02s goin bad. thanks for pointing me in the obvious direction.

 

Yup - its almost guaranteed to be the fuse (now that you mention pulling the fuse-pump fuse).

And no probs - thats why we are here.

 

Either the fuse or the wiring harness. I would check the fuse first.

 

yea so far it looks like the fuse was the problem, light hasnt came back on and boy do i feel stupid. just glad i got a serious response without flaming just sometimes the obvious is just too simple to think out. thank you