Genuine GM Cadillac Northstar Air Injection Check Valve 2004-2005 - 12584623

This is a used but fully operational genuine GM part for your Cadillac Northstar engine.

It's the air injection check valve, a crucial piece of the emissions system.

If you're getting check engine lights or having smog issues, this might be your fix.

It fits 2004 to 2005 models and carries the manufacturer part number 12584623.

Just so you know, it supersedes the older part number 12619127, so it's the updated version you'd want.

It's a used OEM part, so it might show a little cosmetic wear from being installed before, but it's been tested and works as it should.

A solid, money-saving option compared to buying a crazy expensive new one from the dealer.