Beetle L4-1781cc 1.8L Turbo (APH) (1999)
If the specification is obtained:
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Change to display group 36 as follows:
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Press C key.
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Press keys 0, 3 and 6 for "Display group number 36" and confirm entry with Q key.
Indicated on display (1-4 = Display zones)
System in basic setting 36
->
1
2
3
4
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Check the oxygen sensor voltage in display zone 1.
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Allow engine to run at an increased speed until:
Specification: "B1-S2 OK." appears in display zone 4.
If the diagnostic is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON."