Alfa 147 corrosion weak spot
The Alfa 147, so far as I could tell before I bought one, doesn't have much of a problem with the dreaded R word. Rust. I understand there's a lot of galvanised metal on these cars, so rust isn't really an issue.
But the older cars are 9 or 10 years old now. Its possible that corrosion can start to take hold on ANY car of this age. On mine, I've noticed that there are one or two specific trouble spots, where rust can get a hold if you are not careful.
The biggest weakness seems to be the two legs which drop down from the chassis ahead of the front wheels, and which are used to hold the front bumper in place. The bottom ends of these legs are prone to being soaked in salt water when the car is driven during the winter months and they aren't painted/corrosion-proofed very well, so after a few years they can show signs of corrosion. After 9 years, if you are unlucky, they may start to look as though they been manufactured from metal that has been recycled from a Lancia Beta...
I've also noticed that the floorpan is vulnerable to a bit of surface rusting here and there, despite the corrosion proofing that is applied. Nothing's gone through on my car yet, but the surface rusting needs to be identified, treated and kept under control. Don't neglect it.
So if you've got an Alfa 147, it is probably a good idea to check these points and make sure the corrosion proofing is up to scratch. The upper body will probably be fine, completely rust free, but it is the underside where you really need to keep your eyes peeled...!