100 Quattro Sedan L5-2309cc 2.3L SOHC (NF) (1989)
10.
Compare the mA readings with the oxygen sensor connected and disconnected. The mA readings should not differ by more than +/- 3 mA.
11.
Adjust the mixture by drilling a hole in the mixture adjustment concealment plug (located on the air flow sensor housing, between the fuel
distributor head and the intake air boot), and using a sheet metal screw and pliers to extract it.
12.
With the engine running, and the oxygen sensor connected, turn the adjustment screw with a 3 mm allen wrench until the mA readings are within
specification.