Touareg V8-4.2L (BAR) (2007)
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Switch the ignition off.
If the specified value was not obtained:
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Replace the Heated Oxygen Sensor (HO2S) (G39) or the Heated Oxygen Sensor (HO2S) 2 (G108).
If the specified value was obtained:
Checking wiring
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 ] See: Testing and
Inspection/Component Tests and General Diagnostics/Engine Control Module, Replacing.
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Using a Multimeter, check the Heated Oxygen Sensor (HO2S) (G39) or the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness
connector terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T121 terminals for an open circuit.
Specified value: 1.5 ohms Max.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.