P0078 Audi Exhaust Valve Timing Control Magnet Retarder Circuit Bank 1
Possible causes
– Faulty Exhaust Valve Timing Control Magnet Retarder
– Exhaust Valve Timing Control Magnet Retarder harness is open or shorted
– Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector
– Exhaust Valve Timing Control Magnet Retarder harness is open or shorted
– Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector
What about the obd code?
An improper voltage is sent to the Engine Control Module (ECM) through exhaust valve timing control magnet retarder.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0078 Audi Description
Exhaust valve timing control magnet retarder controls the shut/open timing of the exhaust valve by ON/OFF pulse duty signals sent from the Engine Control Module (ECM). The longer pulse width retards valve angle. The shorter pulse width advances valve angle.
Audi Vehicle:Audi A1,Audi A3,Audi A1,Audi A3,Audi A1,Audi A3,Audi A4,Audi A5,Audi Q3,Audi A5,Audi Q5,Audi A3,Audi A4,Audi A5,Audi TT,Audi Q3,Audi Q5,Audi S3,Audi TTS,Audi RS 3,Audi TT RS,Audi A7,Audi Q7,Audi A8,Audi A6,Audi S4,Audi S5,Audi Q5,Audi S6,Audi S8,Audi S5,Audi A8,Audi R8 V8,Audi RS 5,Audi S6,Audi R8 V10,Audi R8 GT,Audi A8L