Exhaust Gas Recirculation System, Overview

Notes:
Function/control of the EGR system is checked via Motronic On Board Diagnostic system.
Components marked with an * are checked via On Board Diagnostic procedure.
Components marked with ** are checked via Output Diagnostic Test Mode.
Always replace sealing rings and gaskets when assembling.
Vacuum lines and hose connections must be leak-tight.
Vacuum lines must not be blocked or kinked.