More technical help available: https://mercedessource.com/problems/engine/understanding-and-testing-the-egr-valve
Kent explains the function of an EGR valve and how to test one using a vacuum hand pump tester. Activation systems trouble shooting and repair are not covered in this video. Only the EGR itself is covered. On cars 20 years or older these valves are failing right and left.
Post time: Oct-21-2017