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So it turns out the frequancy valve is working. I checked it on another
Somehow the ECU is not supplying the frequancy valve with power/signals.
I checked the wiring and grounds and they are all O.K.
I don't however know how to check the Oxygen sensor or if it's failure
results in a non functioning frequancy valve.
Thanks in advance for any help.
1982 Audi Coupe Turbo (475,000 km)
1982 Audi Coupe Quattro (155,000 km) Coupe with 4kq floor
1983 Audi Ur-quattro (220,000 km)
1986 Audi 4000 S Quattro (360,000 km) with 5 bolt pattern
C.E.O. of examlastminuteallnighterrollthedice inc.