Jetta V6-2.8L (AFP) (1999)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor and O2 Sensor Control Before TWC, Checking
Sensor and Control Check
Oxygen Sensor and Oxygen Sensor Control (Before Three Way Catalytic Converter (TWC)), Checking
NOTE: Only gold plated contacts must be used to repair contacts 3 and 4 in the oxygen sensors harness connectors.
Special tools and equipment
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VAG1551/VAG1552 with VAG1551/3 adapter cable
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VAG1598/31 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test requirements
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Fuse 43 OK
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Battery (B+) voltage at least 11.5 V
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Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head must be free of leaks
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Min. coolant temp. 85 °C See display group 04, display field 3
Functional check
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Connect VAG1551 (VAG1552) Scan Tool (ST).
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Switch ignition on and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (when doing this engine must be running at idle).
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
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Press buttons -0-, -3- and -0- to input display group number 30 and press -Q- button to confirm input.
Indicated on display: (1-2 = display fields)
Read Measuring Value Block 30
->
1
2