S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Procedure for accessing the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness.
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Remove the left side engine compartment cover - 1 -.
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Remove the coolant expansion tank screw - arrow -.
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Disconnect the electrical connector from the Engine Coolant Level (ECL) Warning Switch (F66) and set aside coolant reservoir with coolant hoses
- 1 -and - 2 - connected.
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Disconnect the Heated Oxygen Sensor (HO2S) 2 ( G108) electrical harness connector - 4 -.
