Have 2001 E430 with CEL on . I had the code read and it was the coolant temperature sensor. I replaced the sensor but the CEL is still on. How do you reset the light?

 

The code readers usually have a reset button.

 

If I would have known how to do that reset I would not have asked the question . I do not own a code reader . So, how do I reset the thing ?

 

No reply, So how do I get the light to go out?

 

without the ODBII reader with reset function on hand, you either borrow one
from the neighbor/friend, go to an independent/MB repair shop, or, depending
on the origin of the CEL trigger, get lucky...fix it, and after a while, hope that
it extinguishes by itself (some do, some don't, depending on the trigger).

to get an idea how ODBII is set up, causes, false positives, auto reset, etc
you can read this. jump to page 20
there may be other, easier primers but i'm too lazy to hunt. use Google