A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
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Remove engine cover.
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Remove the Intake Air Temperature (IAT) Sensor ( G42).
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Spray the Intake Air Temperature (IAT) Sensor ( G42) with a commercially available cool spray while observing the temperature value on the
scan tool.
The temperature value must decrease.
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End diagnosis and switch the ignition off.
If the intake air temperature does not decrease:
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Replace the Intake Air Temperature (IAT) Sensor ( G42).
If the intake air temperature does decrease:
Checking internal resistance
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Disconnect the Intake Air Temperature (IAT) Sensor (G42) electrical harness connector - 1 -.
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Using a multimeter, check the Intake Air Temperature (IAT) Sensor (G42) terminals 1 to 2 for resistance.
Use the chart below for the specified values:
Specified values:
