First time here, but I recently purchased a k&n box filter for my tC. After about 5 miles the check engine light came on and was giving a p0171 (too lean in chamber 1). When I switch back to my old filter after about 5 miles the light will switch off showing the mass air sensor is working has anyone else had this issue? Could it be because the k&n's are oiled cloth instead of paper? Any help would be great.