Passat Sedan V6-2771cc 2.8L DOHC (AHA) (1998)
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Heated Oxygen Sensor (HO2S) -G39-, bank 1 4-pin harness connector (black, arrow).
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Heated Oxygen Sensor (HO2S) 2 -G108-, bank 2 4-pin harness connector (black, arrow).
NOTE: To reach this harness connector, remove coolant reservoir attachment screws and tilt coolant reservoir to the side. The coolant hoses remain
connected.
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Connect multimeter for voltage measurement to terminals 3 + 4 of the respective connector to Engine Control Module (ECM) and measure
primary voltage.
Specified value: 0.40 to 0.50 volts
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Switch ignition off.
If specified value is not obtained on one or both Heated Oxygen Sensors (HO2S):
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Test oxygen sensor wires.
If specified values are obtained:
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Replace the respective oxygen sensor:
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Heated Oxygen Sensor (HO2S) -G39-, bank 1, item 1
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Heated Oxygen Sensor (HO2S) 2 -G108-, bank 2, item 15
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. Refer to "Monitors, Trips and/or Drive Cycle/Readiness Code, Generating". See: Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking oxygen sensor wires
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Connect test box to control module wiring harness, connect test box for wiring test. Refer to "Scan Tool Connecting/Test Box, Connecting For