Would anyone have any recommendation on where I should look next? There has been a huge debate in several forums as to whether the K&N filter actually caused the problem, but I’ll try to keep an open mind. I’ve also replaced the filter with a conventional air filter. I didn’t find any evidence of oil but decided to clean it with a spray for this purpose anyways. Place the new air filter in the housing unit. Wipe both the internal and external surfaces of the unit down with a slightly damp cloth. Some recommend cleaning the air flow sensor, which could be covered with oil. Clean any remaining debris out of the air filter unit.
After a little searching on Google, I discovered that several other folks had experienced issues with the check engine light after installing a K&N filter. This seemed rather strange, and I suspected that something upstream could be causing the problem. Since the dealer where I purchased the truck was simply too busy to look at the problem, I purchased a code scanner and discovered that both oxygen sensors in front of the catalytic converter were faulting (I had 33k miles on my truck at the time). After a few weeks I noticed my Check Engine light turned on although the truck seemed to be running fine. I forked out the nearly $50.00 and installed the pre-oiled filter with hopes that I would gain at least a few mpg’s. I decided to try a K&N filter after hearing my friends rave about them.
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