CIS-E Motronic (engine code 9A)

Cars with the CIS-E Motronic engine management system feature built-in electronic fault diagnosis which detects faults in the ignition system during normal operation. When activated, the control unit displays faults as a number code which corresponds to a particular component or function of the system which should be checked.

Your authorized Volkswagen dealer's service department is equipped with an analyzer which plugs into a special test connection in the car's wiring harness. It can retrieve and interpret the fault codes, and also perform electronic checks of the knock control reference sensor, the Hall sender, and the knock sensors.