Hello all!

I have a Nissan Serena 2.0 (petrol, manual).

The engine, whilst idling and whilst driving, rattles - sounds like the drive chain...should the drive chain make such a noise normally? Does it mean it needs replacing? Tightening? Is it an easy job to undertake myself? Is it an expensive job?

Otherwise, could anyone think of another reason for this noise? The engine pulls well enough, causes no problem when driving...Just would like to attend to the issue before it became a problem!!!

Thankyou so much for reading!