Beetle L4-1781cc 1.8L Turbo (APH) (1999)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Before Three-Way Catalytic Converter Aging, Check
Manufacturer's Scan Tool
Oxygen Sensor Aging, Heated Oxygen Sensor (HO2S) -G39-, Checking
Special tools, test equipment and auxiliary items
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Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3B
Test conditions
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Coolant temperature must be at least 85 °C, see display group 04, display zone 3
Functional check
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Connect scan tool VAG 1551 (VAG 1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must
be running at idle speed. Connecting scan tool and selecting Engine Control Module (ECM).. Refer to "Scan Tool Testing/Scan Tool Connecting
and Initial Checks/VAG 1551 Scan Tool", See: Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press keys 0 and 4 for the function "Basic Setting" and confirm entry with Q key.
Indicated on display
Basic setting
Input display group number XXX
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Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.
Indicated on display (1-4 = Display zones)
System in basic setting 34
->
1
2
3
4
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Check specifications in display zones 1-4.
If the diagnostic is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON."
Display Group 34
If the specifications are 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.