OBD Audi Multiport Fuel Injection

The document discusses On Board Diagnostic (OBD) systems for Audi vehicles with Multiport Fuel Injection (MFI). It describes different engine control modules used, and the key features of OBD I and OBD II systems, including permanent memory, data output methods, address words, and modes to access diagnostic data and testing results. It also covers the functions of the Malfunction Indicator Lamp and procedures for malfunction recognition and repair using diagnostic tools.