Golf GL L4-2.0L (AEG) (2001)
A: High oxygen sensor voltage
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Rich mixture (excess of fuel or shortage of air)
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Higher CO value
B: Low oxygen sensor voltage
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Lean mixture (shortage of fuel or excess air)
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Lower CO value
If the specified values are 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.
Continuation
If the oxygen sensor control in display field 1 does not fluctuate as stated:
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Press -> buttons.
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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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Perform test drive in order to remove possible residue on oxygen sensor and repeat check.
Observe the safety precautions when performing a road test. See: Fuel Delivery and Air Induction/Service Precautions/Technician Safety Information
If the specified values in display field 1 are not obtained even after a test drive or the value does not fluctuate by at least 2%:
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Check oxygen sensor (before Three Way Catalytic Converter (TWC)) aging. See: Aging Check
Evaluating display field 32, display fields 1 and 2: Oxygen sensor learned values before Three Way Catalytic Converter (TWC)