Touareg V8-4.2L (BHX) (2004)
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If a temperature is indicated which is below the ambient temperature of sensor, first check sensor wires for contact resistance. Note that while the
vehicle is standing still the sensor might warm up due to radiant heat.
If specified value is obtained:
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Remove intake air duct for cylinder bank 1.
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Remember the intake air temperature value.
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Spray the sensor (arrow) with commercially available chilling spray and watch the temperature value. The temperature must
decrease.
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End diagnosis and switch ignition off.
If the intake air temperature does not drop:
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Replace Mass Air Flow (MAF) Sensor (G70).
‹› The Intake Air Temperature (IAT) Sensor (G42) is a component of the Mass Air Flow (MAF) Sensor (G70) and cannot be replaced individually.
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Erase DTC memory of Engine Control Module (ECM) , Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code.
Continuation of test if indication is approx. -40° C:
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Disconnect 5-pin connector from Mass Air Flow (MAF) Sensor (G70) with Intake Air Temperature (IAT) Sensor (G42) arrow.