GarciaMaxima

I got the following lights right after putting back together my air intake, since I had to remove it to get to the starter I changed.
1.Code 0503 Upstream oxygen sensor or circuit fault (right bank)
2.Code 0303 Upstream oxygen sensor or circuit fault (left Bank)

And this one I already had before
3. Code 0204 Kock sensor or circuit fault

Any translation of what the first two mean?
What can I check first?

DAVE Sz

iTrader: (2)

well, my first guess would be that your front O2 sensors are gone but that's only cause that's what the name of the code says. the KS is there cause of the o2 sensors.

tomservo291

did you triple check all those connections you took off the intake when reassembling? make sure no wires pulled loose of the harness or anything... i had one wire pull out of its seating in the harness but wasnt visible, took awhile to catch that.

GarciaMaxima

yes I did triple check, but I will do a fourth check since the CEL came on after I reattached everything

99SEL4ME

My CEL light came on last a week ago this past Wednesday. I read the stickies on how to get the code and was given 0413, 4 long, 13 short. Looked it up and found that there is no such code. I reset the engine light and hasn't come on since.Something must have tripped it.