Oxygen Sensor
- Ensure exhaust system is not leaking. Warm engine to normal operating temperature with all accessories off. Remove differential pressure regulator connector. Connect Wiring Harness Adapter (VW 1315 A/1) in series. See Fig 1
.
- Attach Multimeter (US 1119) to adapter and set meter on DCA 200m scale. Remove PCV hose and vent to atmosphere. Remove 90 degree "T" connector and insert port with small vent hole into intake air boot. See Fig 2
.
- Start engine and allow to run for 2 minutes. Meter reading should start fluctuating. If reading does not fluctuate, raise engine speed to 3000 RPM. If meter reading fluctuates, oxygen sensor is okay. If reading still does not fluctuate, check control unit and wiring harness for short or open circuit.
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Courtesy of VOLKSWAGEN UNITED STATES, INC.