Replacement O2 Sensor For PLX SM-AFR

[cbird77]

PLX has a procedure for troubleshooting. I found it online. Lets you know if it is the sensor or the module.

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[TurboDave]

dave, where is your PLX grounded?

what does the PL show the AFR is while the PLX is warming up?

Bob

Basically I have a ground wire running from the block into my ecm case. Also connected to that same spot is the wideband ground. At key on after the car has sat for a long time it reads 14.5, moves up to about 16.0 for few seconds then continues on up to 19.99. Is that what you're asking?

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[cbird77]

That sounds like it's working. When my sensor was bad it would not go above 14.5. New sensor went to 19.99. http://www.plxdevices.com/support/manuals/SM-AFRGen2UsersGuide.pdf

 

[TurboDave]

That sounds like it's working. When my sensor was bad it would not go above 14.5. New sensor went to 19.99. http://www.plxdevices.com/support/manuals/SM-AFRGen2UsersGuide.pdf

My issue is an unusual offset. When I have narrowband tracking active and the target is 14.5, the wideband is reading 15.3ish. I believe its been doing this for a few years. Even when I was running translator pro.

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[cbird77]

Compare the old sensor and new sensor (when you get it) with KOEO. Old sensor might be lazy around the 14.5 afr voltage area. Let us know.

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[TurboBob]

Basically I have a ground wire running from the block into my ecm case. Also connected to that same spot is the wideband ground. At key on after the car has sat for a long time it reads 14.5, moves up to about 16.0 for few seconds then continues on up to 19.99. Is that what you're asking?

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pretty much, another test is to start the car and look at the wideband reading before the sensor has a chance to warm up. the PLX the output is 14.5 or so until the sensor warms up.

Bob

 

[TurboDave]

pretty much, another test is to start the car and look at the wideband reading before the sensor has a chance to warm up. the PLX the output is 14.5 or so until the sensor warms up.

Bob

Did that this morning, at that checks out.

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[cbird77]

Dave, here's a short video I took this morning.

 

[TurboDave]

Pretty much just what mine does.

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[TurboBob]

dave, your sensor is in the test pipe? an exhaust leak at the slip joint could draw in a little air making the wideband show a little lean...

Bob

 

[TurboDave]

No, mine is in the lower section of downpipe. About 18" up from the end of the downpipe. The downpipe has a large band clamp holding it to the test pipe.

O2 placement.

Band clamp

 

[TurboTdr3.8]

Dave, here's a short video I took this morning.

That is the way mine works maybe a few seconds quicker

 

[turbo nasty]

With everything cold and key on no start mine does the same..... Goes to 19.9 and then says LEAN on gauge

 

[TT/Ameasap]

Thats what mine does too.