How to Fix Check Engine Light | Fix code P0400 | Clean EGR valve on Mercedes ML500 (W164)

How to Fix Check Engine Light | Fix code P0400 | Clean EGR valve on Mercedes ML500 (W164) in Easy Steps. Things you need: Tools Ratchet set Pliers B-12 CChemtool / Carburetor Choke & Throttle Body Cleaner Rubber Pipes actron CP9125 / OBD II PocketScan Thanks for watching, Enjoy, and please don’t forget to: LIKE, COMMENT, FAVORITE, SHARE and SUBSCRIBE. Please SUBSCRIBE, If you haven’t done so yet, take a look around. If you like what you see be sure to Subscribe to be notified when new content is posted.