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Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heater For O2 Sensor Before TWC, Checking

With Generic Scan Tool

Oxygen Sensor Heater For Oxygen Sensor Before Three Way Catalytic Converter (TWC), Checking

NOTE:

-

Vehicle must be raised before connector for oxygen sensor is accessible.

-

When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.

Recommended special tools and equipment

-

VAG 1526 multimeter or VAG 1715 multimeter

-

VAG 1594 connector test kit

-

Wiring diagram

Test requirements

-

The respective fuses of Heated Oxygen Sensor (HO2S) -G39- must be OK.

-

Ignition switched off.

Test sequence (Vehicles with engine code AEG)

-

Unscrew protective cover (arrows) and disconnect 4-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.

Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > Oxygen Sensor Aging, Check > Page 3090

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