need wiring codes (colors to pins) for mass air flow sensor 2001 Audi A4 1.8

Have four wires that are supposed to connect to 5 pin connector that plugs into Mass Air Flow sensor. Previous owner monkeyed with connector, not sure of wiring configuration. Car ran rough when connected. Currently running vehicle w/o mass air flow connected...burning rich, but running O.K. I have the original wires coming into pin from engine...one is green, one is green & yellow, one is yellow, and the last one is green and white. I am not sure what wire goes to what pin. Any idea what the correct configuration is? Left to right as plugs into MAF. Thanks!