The Best K&N Air Filter Check Engine Light Ideas. Have already disconnected the batterys. Web last wednesday i swapped a k&n air intake n filter on my 05 f150.
At 1st it seemed as if it were getting worse mileage and lower power which has seemed to straighten out but yesterday morning the check engine light came on. Web my jetta finally came in on thursday and today i installed the k&n drop in filter and a abd strut tower brace. Web check engine light after installing k&n filter.
