Golf GLS L4-2.0L (AEG) (2001)
Possible causes of malfunction if oxygen sensor control frequency is too slow:
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The slots or holes in O2S sensor body are blocked
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The O2S sensor vent hole in area of connecting wire is blocked
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The O2S sensor has been overheated (glazed)
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The O2S sensor has been damaged by leaded fuel
Checking oxygen sensor basic voltage
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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).