Jetta GLX V6-2.8L (AFP) (2002)
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 wiring for oxygen sensor 1
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Remove wiper arms and plenum chamber cover.