× 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

P0400 Diagnostic Trouble Code Discussion for June 2012

Exhaust Gas Recirculation System Flow Malfunction

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1998 Mercedes-Benz E320 3.2L MIL Lamp on VIN: WDBJF65F1W
P0400: EGR Malfunction. Good morning, I'm trying to find what ground signal or what is normal for the rear heater circuit on this vehicle. I have my voltage going to O2's, and the computer is grounding the O2's for 100ms, 1 time every second. For the 100ms the rear heaters are on the...
June 27, 2012