[Walt White Coupe]

So I got an engine light and my Carly reader says:

Code 12B801 - Heating lambda probe down stream of catalyst 2, Function: internal resistance too high. React Immediately.

Looking for any "how to's" about replacing the sensor before I jump into it. ???

I'm also wondering that when I replace the sensor, will the "Check Engine" dashboard light go away or do I have to do something else to make that happen?

Thanks in advance.