This should help
Copied from the AOC tech section. Makes sense to show newbies though, but hope that gives a taste of what the club has the offer
Use this thread to discuss problems, weaknesses and things to look out for when buying a new DCi.
Whining turbo
If there's a very loud whistling or whining noise when driving it's possible the bearings are going in the turbo. It's a common fault and is the DCi's only real weakness.
Rattling timing chain
Can cause problems starting, stalling, and a rattling noise on tickover. Listen with a tube around side of the engine with the belts and see if there's any abnormal noises.
Earth strap
The earth strap from the battery to the gearbox can come away, check that it's ok. Simple job to fix thouugh. Can cause running problems but not always.
(For more general issues with the chassis common to all N16s see here -
http://www.almeraownersclub.com/threads/39573-N16-Buyers-Guide-Things-to-look-out-for-weaknesses)
If you think or know of any more feel free to post and I'll add it to the list
.
As with most engines a regular service (especially an oil change) can prevent the chain and turbo issues. The DCi well cared for will do you well.