Replacing alternator belt on 2007 1.3 cdti combo is it easy to do

You have a CAN-BUS communication malfunction. In other words probably a broken wire, bad connection.

It appears you got two belts on this, You would remove power steering belt first. Sometimes, the power steering body has bolts you can loosen, to get slack in the belt, with the bolts loose, you rotate the body, to get slack in the belt. With the belt on the right, you would rotate the tensioner to get slack in the belt, to remove and install.
I had to go to paint to draw the belt diagram, so it isn't exact, but, should be close enough.
I have no repair info on this vehicle.

Baaaad alternator!!!

images for 2008 corsa diesel cdti ecoflex belt

First..,Get new part and also a new belt if belt has never been changed..Make sure part is correct,Use safety glasses..Be sure engine is cold..,Notice sticker under hood that shows belt routing diagram..If there isn't a sticker you can hand draw your own..Disconnect battery ground cable..Remove serpentine belt..If you have never replaced a serpentine belt it will get you confused but it is VERY EASY..It should have a diagram of how it is removed on the sticker showing the belt..The salesman at the parts store can show you easier than I can tell you..After removing belt ..,inspect all pulleys for tightness or any type of wobble..Look for any small shines of metal fragments around pulleys..Spin pulleys to make sure they don't have a worn bearing noise and they spin freely......If one seems damaged now is the time to replace it...remove wiring from alternator carefully..Remove alternator mounting bolts..Use a small pry bar or large flat screwdriver to pry the alternator carefully at both sides upward to remove it..It has a small bushing inside of the lower mounting holes which slides in and out to help keep alternator in position.The old alternator is to be turned in to parts store for a core credit so try not to damage it....Lube mounting holes of new alternator so it will slide into place smoothly..Install bolts and get them all hand tight then snug each bolt lightly until they are all seated then torque each bolt..Torque tight but DONT OVER TIGHTEN..It should be no more than 40lbs.torque..carefully connect alternator wiring..Install new belt..Doublecheck everything..,remove all tools from under hood..Coonect battery and start engine for safety check...

If you know where the alternator is then this is a pretty easy thing to replace. You will have to remove the serpentine belt which is held tight by the idler. You can release the tension on that with one bolt. Once that is loosened then you can remove the alternator which in most cases is three bolts. Once those are out you can manipulate it out for replacement. Disconnect the battery before you start.

Well first, is it auto or manual? The answers are different depending.

try getting a manual from www.reliable-store.comit's very helpful in repairing info
or try manualslife.com
very good online places, makes repair very easy and simple