Does anyone has info on:

How many sensors are there in the petrol engine of Logan which control fuel and engine emissions?

Do dealers give print out of the recordings of engine sensors and engines workings?

The Logan has a OBD and you will find this in the glove compartment and if you get the correct equipment you will be able to see any of the problems on your Motor (if any) nearly all OBDs will work and here is a link to one that you can ven download to play with as for how many sensors I have no idea
Stu

http://obddiagnostics.com/

Stu are you familiar with Vapor canister? Is it connected to a sensor?

Check your PMs Mmehra