LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 1990 >> 760 GLE, AW71 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel Control >> Oxygen (O2) Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Oxygen (O2) Sensor

  1. Warm engine to normal operating temperature. Connect exhaust gas analyzer. Disconnect O2 sensor wire (at O2 sensor) from ECU.
  2. Connect a jumper wire between ECU wiring (O2 sensor harness side) and ground. CO content should increase, indicating ECU and its connections are okay.
  3. Connect a voltmeter to O2 sensor. While engine is running voltmeter should fluctuate at approximately 0.5 volts if CO constant is normal. Replace O2 sensor if not within specification.
scientia non olet · About LEMON Manuals