Jetta Sedan L5-2.5L (CBTA) (2009)
terminals 1,2,5, and 6 for voltage.
Specified value: 2.40 V - 2.99 V
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Switch the ignition off.
If the specified value was obtained:
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Replace the Heated Oxygen Sensor (HO2S) (G39)
If the specified value was not 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 --> [ Motronic Engine Control Module, Replacing ] .
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminals to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T121 terminals for an open circuit.