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bpu699 bpu699 is offline
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Join Date: Apr 2007
Location: wisconsin
Posts: 2,539
Originally Posted by oilonly View Post
Just a guess here and maybe you checked already, the black relay in the back panel supplies power to the oxygen sensor make sure that is connected well. Don't know if using the stock oxygen sensor for your AFR gauge is correct either. How is your PLX gauge getting power?
With the PLX, there is only one 02 sensor. This feeds the module, which then displays your afr.

The module also has a wire to pass the 02 sensor info onto the cars computer, for folks that want to use the lambda function.

I will check the voltage output of this wire to make sure it is transmitting that the o2 sensor is reading rich. I suppose the unit could be bad. But I believe I had this issue before installing the afr meter.

So you guys are saying that the feed from the o2 sensor goes to a computer under the drivers seat, correct? I will remove the seat and check for corrosion, etc.

I do appreciate folks help. I hope this also helps others down the road.

Old 11-03-2014, 10:55 AM
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