Golf L4-2.0L (AEG) (1999)
If the specified values are not obtained:
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
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Turn off ignition.
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Remove protective cover (arrows) and disconnect 4-pin harness connector (black) -1- from Heated Oxygen Sensor (HO2S) -G39- before Three
Way Catalytic Converter (TWC).
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Check oxygen sensor heater for continuity at oxygen sensor harness connector terminals 1 and 2.
NOTE: The heating element resistance is approx. 1-5 ohms at room temperature. Even slight increases in room temperature can increase the resistance
greatly.
If it is determined that oxygen sensor heater has an open circuit:
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Replace Heated Oxygen Sensor (HO2S) -G39- before Three Way Catalytic Converter (TWC). Refer item 32, See: Fuel Delivery and Air
Induction/Locations
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing Diagnostic Trouble Codes
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Display readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If DTC memory has been erased, or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, generate the
readiness code again. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If oxygen sensor heater has continuity:
Checking voltage supply