Every recalled K&N fuel filter is believed defective, and the company is refunding buyers rather than offering any replacement partsO-rings used in the fuel filters are prone to disintegration. Several different K&N fuel filters are involved in the large recall. If you, or your mechanic, recently fitted a new K&N fuel filter to your car, it needs to come back out and go straight in the trash, replaced with an original filter or another compatible unit. After discovering the issue, K&N ceased shipments from the supplier responsible and has discontinued impacted fuel filters. However, the company will refund the purchase price of the recalled fuel filters, once shoppers provide it with proof of purchase.