Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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VAG 1551: Press key 3
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VAG 1552: Press key (Up arrow)
Indicated on display (1-2 = Display zones)
Read measuring value block 33
->
1
2
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Observe oxygen sensor control in display zone 1.
Display Group 33
If the specification is obtained:
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Press -> key.
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Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
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Switch off ignition.
Continuation
If the oxygen sensor control in display zone 1 does not fluctuate as stated:
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Press -> key.
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Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
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Carry out a test drive to remove possible residue on oxygen sensor and repeat check.
Observe the valid safety precautions when carrying out a road test.
If the the specifications in display zone 1 are not obtained even after a test drive, or the value does not fluctuate by at least 2 %:
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Check the oxygen sensor before catalyst for aging. See: Oxygen Sensor Before Three-Way Catalytic Converter Aging, Check
Evaluating display zone 32, display zones 1 - oxygen sensor control learned values before catalyst