Functional check of the oxygen sensor
1. Connect the VAG 1551 fault code reader (V.A.G 1552) and dial "01" "Engine Electronics". The engine should idle. The display should show the following information:
2. Press "08" to select the "Read measured value block" function and confirm by pressing the "Q" button. The display should show the following information:
3. Select the desired group. Press "00" to select "Display Group" and confirm with "Q". The display should show the following information:
4. Write the data in field 1 (coolant temperature). Specification value: max. 22 (corresponding to at least 85°C). If necessary, warm up the engine to the required temperature.
The original can be viewed on the portal [www.VWMANUAL.ru]
5. Write the data in field 5 (lambda coefficient). Specification value: between 106-150.
6. Write the data in field 6 (altitude correction).
7. If the required value is reached, press "→". Press "06" to select the "End Output" function and confirm by pressing the "Q" button.
8. If the required value is not achieved, check:
- oxygen sensor heater;
- air intake system;
- spark plugs and high-voltage wires;
- activated carbon filter solenoid valve;
- absence of carbon deposits on the oxygen sensor. Replace the sensor if necessary.
Checking the oxygen sensor wiring
9. Turn off the ignition.
10. Connect the VAG 1598/18 tester to the engine control unit wiring harness (Fig. 5.45).
11. Disconnect the four-pin wiring connector from oxygen sensor 1 (Fig. 5.46).
12. Check the wires between the tester and the four-pin connector of the control unit wiring for an open circuit: contact 3 and socket 15, contact 4 and socket 38. Wire resistance: max. 1.5 ohms.
13. Additionally, check the wires for short circuits to each other, to the vehicle ground, and to the positive battery terminal. Specification resistance: ∞ Ohm.
14. If the specified resistance is not reached, check the wiring according to the wiring diagram.
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