1997 AUDI A4 check engine

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AUDI A4 1997 B5 / 1.G AFC Engine Cold Start Driveability Problems Workshop Manual 24-44
      
CAUTION! 
     
Use a second technician to operate the VAG 
1551 scan tool. 
     
-  Start engine (without previously switching 
ignition off), drive and record voltage signal 
(display