turn signal AUDI A4 1997 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual

24-89

If the specified values in display fields 1
and/or 3 do not match the specifications, or if
the readout does not fluctuate by at least 2
%:

- Check oxygen sensor heater Page 24
-114
.

- Check oxygen sensor signal wire and activation
Page 24
-122
.

- Check intake system for leaks and eliminate
false air Page 24
-76
.

- Check fuel pressure regulator Page 24
-33
.

- Fuel return line kinked or plugged.

-
Press button.
- Press button -0- and -6- to select function "End
Output" and confirm with -Q- button.

- Switch ignition off.
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