Originally Posted by Interco37
I have a K&N cold air intake and was wondering what this is doing for my engine? Check engine light was on this week and Ford said it is related to the K&N,BUT it has been on the truck for 64,000 miles and hasent had any problems before.They just sold me the truck with a $2,500.00 extended warranty should I have them install the factory system to protect my warranty?
I have seen many comments on another forum saying specifically K&N filters are the worst because they supposedly release a lot of the oil and it screws up the turbo (don’t know if this is an urban legend) . I have seen an article that discussed tests that K&N did to respond to the accusation that their filters cause check engine lights. Their testing did not show any negative impact on the engine. I also seem to remember seeing that K&N guarantees that their filters will not damage your engine. Not sure how accurate this info is but you could probably contact K&N on that.
As for the warranty issue, look into the Magnuson (I’ve seen it spelled with two “S”s too)-Moss Act. Basically the dealer/Ford has to show that the aftermarket part caused any damage/failure. I think K&N will help you with this if the dealer tries to deny coverage due to having one of their intakes