Audi Workshop Service and Repair Manuals > S8 Quattro Sedan V10-5.2L (BSM) (2009) > Sensors and Switches | Sensors and Switches - Powertrain Management | Sensors and Switches - Computers and Control Systems | Oxygen Sensor | Component Information | Testing and Inspection | Oxygen Sensor Heaters After Catalytic Converter, Checking

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Disconnect the brown Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) electrical harness connector- 1 -.

Checking internal resistance

Using a multimeter, check the Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) terminals 1 to 2 for resistance.

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