coolant reservoir AUDI A4 1997 B5 / 1.G ATQ Engine Oxygen Sensor Control Checking

24-89

Checking primary voltage
Component location of harness connectors
Overview of component locations, page Page
24
-5

Note:
Coolant reservoir screws must be removed and
coolant reservoir must be placed to side in order
to access this harness connector. The coolant
hoses can remain connected.

Test requirement:

Fuse for oxygen sensor are OK

- Disconnect 4-pin harness connector leading to
respective oxygen sensor.

If specified value is not obtained: - Connect multimeter between terminal 3 and 4 for voltage
measurement.
- Switch ignition on.

Specification: 0.400 to 0.500 V
- Switch ignition off.
-
Check oxygen sensor wires Bank 1, page Page 24
-90
or Bank Pa
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