OE 21lr4 — Filter, interior air

What is OE number 21lr4?

OE (Original Equipment) number 21lr4 is a manufacturer's reference code for Filter, interior air used to identify the exact specification of a part fitted during vehicle production. By cross-referencing this OE number, you can find 10 compatible aftermarket brands that match the same specification — often at a lower price than the original. All parts listed above are verified to match OE 21lr4.