A6 Quattro Sedan V8-4.2L (BVJ) (2007)
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Remove the vacuum lines - 2 -, - 3 - and - arrows - from the air guide hose.
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Disconnect the Mass Air Flow (MAF) Sensor (G70) electrical harness connector - 1 -.
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Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.
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Disconnect the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 1 -.
Checking primary voltage