Jetta Sedan L5-2.5L (BGP) (2005)
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Replace the Heated Oxygen Sensor (HO2S) (G39)
If the specification is obtained:
Checking voltage supply
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Crank the engine.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 4 to Ground (GND) for voltage.
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Switch the ignition off.
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 4 to the Fuel Pump (FP) Relay (J17) socket 2/87 for an
open circuit, a short circuit to each other, or 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 Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] .
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 3 to the Motronic Engine Control
Module (ECM) (J220) electrical harness connector T121 terminal 5 for resistance.