Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor (Before Three Way Catalyst) Aging Check
Oxygen sensor aging (Oxygen sensor before Three Way Catalyst), checking
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool with VAG 1551/3B adaptor cable
Test conditions
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Engine Coolant Temperature 85 °C minimum See Display group 04, Display zone 3
Functional check
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Connect VAG 1551/1552 Scan Tool, See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting
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Start engine and let idle
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Press 0 and 1 buttons to select "Address word" 01 "Engine electronics"
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Press 0 and 4 buttons to select Function 04 "Basic setting"
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Press Q button to enter input
Display will appear as shown
Introduce basic setting
HELP
Input Display group number XXX
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Press 0, 3 and 4 buttons to select "Display group 34"
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Press Q button to enter input
Display will appear as shown (1 to 4 = Display zones)
Basic setting 34
->
1
2
3
4
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Increase engine speed between 1800 and 2200 rpm and check specifications for Oxygen sensor aging, Display zone 1 to 4
NOTE: Hold engine rpms to specification so the exhaust gas temperature is within specification range during the test. Observe the Oxygen sensor
control status in Display zone 4.
Continuation
If specification not obtained
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Perform road test to free Oxygen sensor of possible residues and repeat test.