420A Running Lean

[BoSsRsT]

I plugged up my car to the OBD II reader, and I am running lean. I honestly don't know what running lean or rich is. So if anyone could explain why I'm lean and how I can fix it it would really help. Thank you.

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[92AWDHX40]

Simple lean not enough fuel, rich too much get a wideband no way around it as far as knowing if your
lean or rich.

 

[BoSsRsT]

What does the wideband, get hooked up to? And what's it main function?

Sent from my SAMSUNG-SGH-I897