S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Check the wiring of the Mass Air Flow (MAF) Sensor (G70)/Intake Air Temperature (IAT) Sensor (G42).
Checking voltage supply
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Remove the engine compartment trim - 1 - and - 3 -.
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Remove the engine cover - 2 -.
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Disconnect the Mass Air Flow (MAF) Sensor (G70) and Intake Air Temperature (IAT) Sensor (G42) electrical harness connector - 4 -.
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Crank the engine.
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70)/Intake Air Temperature (IAT) Sensor (G42) electrical harness connector
terminal 2 to engine Ground (GND) for voltage.