Golf GL L4-2.0L (AZG) (2001)
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Check the status of the oxygen sensor heater in display field 2:
Display: Htng.bef.cat.ON,
Htng.bef.cat.OFF (alternating)
NOTE: Depending on the operating condition of the engine, oxygen sensor heating can be switched on or off, i.e. the indications in display field 2 or 4
can be either Htng.bef.cat.ON or can alternate between Htng.bef.cat.ON/Htng.bef.cat.OFF.
If indications do not resemble description:
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Press -> button.
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Press buttons -0- and -6- to select "End data transfer" function 06. Press -Q- button to confirm input.
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Switch ignition off.
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Unscrew protective cover (arrows) and disconnect 4-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.
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Set multimeter for resistance measurement and connect it to terminals 3 + 4 at connector for oxygen sensor. Check oxygen sensor heater for
continuity.
Specification: 2.5 to 10 Ohms (at room temperature)
If a short circuit is found in the oxygen sensor heater:
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Replace Heated Oxygen Sensor (HO2S) -G39-.
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Check DTC memory, repair any malfunctions and then erase DTC memory.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading
Diagnostic Trouble Codes
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing
Diagnostic Trouble Codes
If oxygen sensor heater has continuity: