1998 AUDI A4 check engine light

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AUDI A4 1998 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-91
      
Checking  
     
-  Start engine and let idle. 
     
-  Switch A/C on, push "AUTO" button, set 
temperature to "LO" and blower speed to "HI". 
     
A/C compressor symbol must light up a