968 Cabriolet L4-2990cc 3.0L DOHC (1993)
Oxygen Sensor: Testing and Inspection
1.
Be sure engine is running at normal operating temperature.
2.
Disconnect oxygen sensor plug.
Oxygen Sensor Connector
3.
Connect voltmeter to terminal 1, sensor half of plug, and ground.
4.
Voltage must be between 0.1 VDC to 1.0 VDC, depending on oxygen concentration in exhaust.
5.
Disconnect vacuum line from fuel pressure regulator. Voltage reading should increase.
