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It will help if you tell us what car you have, and then pose your question in the appropriate section.

This is all at idle, am I right? Do the lights and heater cause the idle to bump up? How about some numbers?
 

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Lights on afrs go down as in lean !!.
AFR going down would mean rich. Is this related to the idle bumping up?

If you scroll down the main forum menu, you will find "MKII 90-99 NA & TURBO" and there you might catch the eye of someone who actually knows about your car.
 

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The O2 sensor voltage is very low (750 milliamps), and it should go directly to the gauge, but it seems like turning on accessories causes a voltage change which affects your reading. Check your wiring to the gauge, or get rid of it.
 
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