Jetta GLS L4-1.8L Turbo (AWD) (2001)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Before Catalyst
Checking
Special tools and equipment
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Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3
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Test box VAG 1598/31
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Hand multimeter VAG 1526 or multimeter VAG 1715
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Adapter set VAG 1594
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Wiring diagram
Check conditions
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Fuse 43 must be OK.
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The battery voltage must be at least 11.5 V.
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Fuel pump relay must be OK
Test sequence
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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 engine must be
running at idling speed.
(Connecting scan tool and selecting engine control module. Refer to "VAG 1551 Scan Tool" See: Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/Scan Tool Connecting
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.
Indicated on display:
Read measured value block
HELP
Input display group number XXX
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Press keys 0, 4 and 2 for "Display group number 42" and confirm entry with Q key.
Indicated on display: (1-4 = Display zones)
Read measured value block 41
->
1
2
3
4
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Check status of heated oxygen sensor before catalyst in display zone 2:
Display: Htg.bC.ON