Have you got Vcds too? I'm guessing you will still have to turn off the light after fitting the extender too.
 
Yes you will need to reset /clear fault codes after fitting the spacer then hopefully your eml won't come back on. Assuming you've sorted your pre cat sensor too of course
 
I can't believe how cheap Vcds is either. Very handy bit of kit really, especially compared to the normal aggro of visiting a garage etc.
 
For anyone else reading I believe as long as it has- M18 x 1.5mm as the fitment, it will work.