Q7 Quattro V8-4.2L (BAR) (2008)
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Switch the ignition on.
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Using a multimeter, check the Mass Air Flow (MAF) Sensor 2 (G246) electrical harness connector terminal 2 to engine Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If specified value was not obtained:
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Check the Mass Air Flow (MAF) Sensor 2 (G246) electrical harness connector terminal 2 to the Engine Component Power Supply Relay (J757)
terminal 2/87 for an open circuit.
Specified value: 1.5 ohms max.
If no malfunction is detected in the wiring and if the voltage supply was OK:
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Switch the ignition on.