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O2 Sensor check 700 1987

posted by  someone claiming to be Herb Goltz on  Mon Jan 13 08:23 CST 2003 [RELATED]

Hello Chris:

You don't need to remove the sensor or jack the car up to check it. You need a voltmeter. First, trace the leads from the sensor up to the firewall. For your model there will be 3 wires, two of which go into a connector. They are just wiring for a heater to get your sensor up to temp quicker. I believe they are green. The wire you are interested in is a single wire-- I think it is white (I may have the color scheme reversed). There will be a spade connector underneath a bullet shaed black cover. Just pull the cover back.

Warm the car up to operating temperature. Uncover the spade connector-- leave all the wires plugged in and the car running. Set your multimeter to DC volts, and the range to <2V. Touch the negative wire of the multimeter to ground (like the strut tower) and the positive to the connection at the O2 sensor. You should see voltages oscillating regularly from around 0.1-0.9V. If not you may have a bad O2 sensor.

Check the 700/900FAQ under the features menu for more details.

Good luck!

Herb Goltz, London, Ontario, Canada '89 760GLE w/mi






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