I think youve pretty well isolated it to water getting on something . I
wouldnt be too concerned about it so long as it doesnt happen
continuously outside of the car wash. Maybe the hyundaitech in this NG
can shed some more light on it.
You could probably check this your self. You'll need to either look down
behind the engine to see the oxygen sensor wiring (if you can) to see if
it's rubbing on the axle shaft, or raise the car and get underneath to
check the same.
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