Originally Posted by Will @ M Developments

I've been learning for the last 5 years and even now have still got plenty to learn!

It is a tricky subject to learn about as you have to be able to recognise problems and identify whether it's a mapping problem or an engine problem. You need a very deep understanding of exactly how each and every sensor works, what can cause problems and most importantly a thorough understanding of how and why the effects you see relate to the changes that you're making.