× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: I guess I don't understand Mercedes EGR monitor theory
Posted to Technical Discussion Forum on 2/25/2021 5 Replies


I usually take a test drive while graphing the engine rpm, MAP sensor, EGR pid, at a minimum and if necessary I tee a vacuum gauge into the EGR valve line.

I've found anything from weak vacuum at the EGR valve to a faulty MAP sensor, even without a M... Login to read more.

5 Replies Received (View Replies)