Jetta Sedan V6-2.8L (BDF) (2003)
VAG 1551: Press button -3-
VAG 1552: Press up arrow button
Indicated on display: (1 to 2 = display zones)
Read measured value block 33 ->
1
2
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Check Oxygen Sensor control in display zone 1. The display must fluctuate in range of -10.0 to 10.0% by at least 2%.
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Check Oxygen Sensor control in display zone 2. The display must fluctuate in range of 1.400 to 1.600 V.
If the displays in display zones 1 and 2 fluctuate:
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Press the -> button.
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Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
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Switch off ignition.
If one or both of the displays in zones 1 and 2 display a value constantly:
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Press the -> button.
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Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
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Switch off ignition.
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Check wiring of Heated Oxygen Sensor (HO2S). See:
If the Oxygen Sensor control in display zone 1 does not fluctuate in the stated range:
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Press the -> button.
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Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
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Carry out a road test to remove possible contaminates on Oxygen Sensor (O2S) and repeat check.
Observe the valid safety precautions when carrying out a road test.Refer to "Fuel Delivery and Air Induction/Service Precautions",
See: Fuel Delivery and Air Induction/Service Precautions/Technician Safety Information
If the specifications in display zone 1 are not obtained even after a road test, or the value does not fluctuate by at least 2%:
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Check Heated Oxygen Sensor (HO2S) for aging
See: .
Possible causes of Diagnostic Trouble Code (DTC) when continuous regulation of sensor is too slow:
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The slots or holes in sensor body are blocked
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The sensor breather hole in area of connecting cable is blocked
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The sensor has been overheated (glazed)
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The sensor has been damaged by leaded fuel
Checking wiring for Heated Oxygen Sensor (HO2S)
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Remove wiper arms and cowl panel:
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Connect VAG 1598/31 test box to control module wiring harness. The Motronic Engine Control Module (ECM) -J220- remains disconnected.