testing an o2 sensor
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Joined: Jun 2003
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testing an o2 sensor
ok... i need to test an o2 sensor on my exhaust manifold. this is a 4.9 96' f150 with 'heated' sensors. there are four wires, two white, one gray and one black. my understanding is that if i connect a voltmeter to a cold sensor with the key on and engine off, it should read around 0.45 volts. After the sensor is properly heated up, i should see a reading fluctuate between 0.2 and 0.7 volts. or, if the system is running lean it should remain below 0.45 volts indicating unburnt oxygen.
i'm getting a lean error code from the computer obdii and would like to know if the sensor is giving a false reading. comparing a cold to a hot reading should give me some insight, right? a sensor that was stuck giving a lean signal would stay below 0.45 even when cold? what wire should i connect the voltmeter to?
i'm getting a lean error code from the computer obdii and would like to know if the sensor is giving a false reading. comparing a cold to a hot reading should give me some insight, right? a sensor that was stuck giving a lean signal would stay below 0.45 even when cold? what wire should i connect the voltmeter to?
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
testing an o2 sensor
A cold sensor reading is useless, other than to show that the sensor isn't open.
The Haynes manual tells exactly how to test all the sensors and what readings you should see under what conditions.
The Haynes manual tells exactly how to test all the sensors and what readings you should see under what conditions.
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