how to test O2 sensor?

65 B/FX · May 18th, 2007, 02:51 PM

Can anyone tell me how to test my O2 sensors on my 93 Cobra? I have a small idle stumble and Ive checked everything else but the sensors and a manifold leak. Hopeing its the O2, not he manifold. Its a VERY small stumble but noticeable. It gets better when I turn on the A/C, but should idle smoother.
Thanks guys.

Fryrice · May 18th, 2007, 11:47 PM

How many miles do you have on it ? You should have 4 sensors since its a V8 dual exhaust .

I think for your year ,since it doesn't have OBD ,you are supposed to replace them like every 40-50,000 miles if they are the 2 wire.

3-4 wire can go a bit longer . You need a scan tool, a voltmeter or digital oscilloscope to test . If the testing shows a problem,you gotta replace them .But if you got 40,000 or more miles,Id go ahead and replace them anyways.

May 18th, 2007, 02:51 PM	#1
65 B/FX Regular Join Date: Mar 2007 Location: Orange County, CA Posts: 53 iTrader: 0 reviews	how to test O2 sensor? Can anyone tell me how to test my O2 sensors on my 93 Cobra? I have a small idle stumble and Ive checked everything else but the sensors and a manifold leak. Hopeing its the O2, not he manifold. Its a VERY small stumble but noticeable. It gets better when I turn on the A/C, but should idle smoother. Thanks guys.

May 18th, 2007, 11:47 PM	#2
Fryrice Hardcore Enthusiast Join Date: Oct 2006 Location: VA Posts: 2,034 iTrader: 0 reviews	How many miles do you have on it ? You should have 4 sensors since its a V8 dual exhaust . I think for your year ,since it doesn't have OBD ,you are supposed to replace them like every 40-50,000 miles if they are the 2 wire. 3-4 wire can go a bit longer . You need a scan tool, a voltmeter or digital oscilloscope to test . If the testing shows a problem,you gotta replace them .But if you got 40,000 or more miles,Id go ahead and replace them anyways. __________________ Fryrice has left the building.

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