Hi and welcome
If you're new to the 169 Panda, I'd recommend checking the following:
Inspect & treat for rust:
- rear axle spring pans
- rear sills (access to treat rust via rubber bung in rear wheel arch)
- rear bump stop turrets - prise off bump stop and inject rust treatment through hole
- engine sump pan
- mud trap behind front springs
- brakes (build-up of rust on sliding surfaces of calipers)
- shock absorbers & springs
Check the 'duckbill' scuttle drains below the wipers are clear - they block easily.
Monitor tyre wear - Pandas can be surprisingly heavy on tyres.
Might be worth cleaning the negative terminal and earth strap connection on body under battery - weak earth can cause all kinds of issues, especially in winter.
Like all chain cam engines, the MJ needs regular oil changes, and like all modern diesels can soot up.
There's a good ongoing MJ rebuild thread by
@DaveMcT that you might find useful:
https://www.fiatforum.com/threads/2009-multijet-engine-out-cam-chain-repair.497454/