A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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Using adapter cables from connector test kit V.A.G 1594 C , connect electrical harness connector terminals 1 + 2 together and observe the
indication on display.
If indication jumps to approx. 140 degrees C:
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End diagnosis and switch ignition off.
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Replace Intake Air Temperature (IAT) Sensor G42
If indication remains at approx. -40 degrees C or -46 degrees C:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
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End diagnosis and switch ignition off.
Testing if display approx. 140 degrees C:
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Disconnect the electrical harness connector - 1 - from Intake Air Temperature (IAT) Sensor G42.
If indication jumps to approx. -40 degrees C or -46 degrees C:
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End diagnosis and switch ignition off.
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Replace Intake Air Temperature (IAT) Sensor G42.
If indication remains at approx. 140 degrees C:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
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End diagnosis and switch ignition off.
Checking wiring:
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Connect the Test Box 105 Pin VAG1598/42 to the wiring harness of the Engine Control Module (ECM) J623. The ECM is not connected.