Where to Test Oxygen Sensor

[kyngfish]

Hi All, I've been poring through old threads trying to find a picture of where to test the oxygen sensor. I have a Fluke Digital Multimeter ready to go.

I need to connect the positive to the signal wire, and the negative to the ground, while the engine is hot to test the sensor. That much I know. The only thing is, where is the sensor wire and which is the signal wire?

Thanks!

[86 911 Targa]

Originally Posted by kyngfish

Hi All, I've been poring through old threads trying to find a picture of where to test the oxygen sensor. I have a Fluke Digital Multimeter ready to go.

I need to connect the positive to the signal wire, and the negative to the ground, while the engine is hot to test the sensor. That much I know. The only thing is, where is the sensor wire and which is the signal wire?

Thanks!

I believe that pins 2&3 are the heater 1 is the signal wire to pin #24 of the DME.

Your voltages should fluctuate between .1-.9 VDC



Good luck,

Gerry

[kyngfish]

Cool. Thought there was a way to test in the engine bay?

[wrxnofx]

You should get a Bentley manual...

[kyngfish]

Between the fluke multimeter a wide band oxygen sensor and a Bentley manual I'll be spending nearly a thousand this week just on tools! Thanks for the photo. Care to tell which is the ground?

[T77911S]

it does not matter. just forget about the - or swap the leads if you don't want to see the - if you connect it backwords

[kyngfish]

(Thumbs Up)

[kyngfish]

This is going to sound like a really stupid question, but I'm REALLY new to all this. The Fluke has a setting for Volts DC or AC - I'm assuming that because the car uses a chemical battery, that the Alternator is also generating DC current and I should always test using the DC setting.

Correct?

[DRACO A5OG]

Dc.

[kyngfish]

Thanks!

[DRACO A5OG]

M,

In the pic above, you want to connect the Red lead from your DVM using alligator clips to post #1, on the connector going to the O2S and the Black lead to a good ground on the engine.

You want to do this when the engine is hot or at 194F aka Operating Temps.

At DC, note the voltage.

[dicklague]

Originally Posted by kyngfish

Between the fluke multimeter a wide band oxygen sensor and a Bentley manual I'll be spending nearly a thousand this week just on tools! Thanks for the photo. Care to tell which is the ground?

I am trying to follow the math

Bentley $150 USD
Multimeter $5.00 to $50 for a good one.....Fluke $400 usd

Wide band o2 sensor $90 [but what do you need this for?

so I am up to $200 on the low side for stuff that works??

[kyngfish]

LM-2 Wide Band Oxygen Sensor 300

I have several things happening at once

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