Touareg V8-4.2L (BAR) (2007)
If the specification was not obtained:
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Replace the Heated Oxygen Sensor (HO2S) (G39).
If the specification was obtained:
Checking voltage supply
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 3 to Ground (GND) for voltage.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 3 to the Engine Component Power Supply Relay (J757)
terminal 87 for an open circuit, or a short circuit to Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Engine Control Module, Replacing ] .
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector to the Motronic Engine Control Module (ECM)
(J623) electrical harness connector T94 for resistance.
Specified value: 1.5 ohms max.