Maybe I've been lucky with mine as it's only had one rear shock replaced and the injectors are all original. It's done over 204,000 miles to date, so coming up for it's 2nd timing belt change.
Never had any of the engine sensors fail as far as I can recall, though I have cleaned the MAF sensor a few times.
Glow plugs have never worked, and as I've never had any problems starting in the depths of winter I've never got round to replacing them (I wager they'd be a bitch to remove now).
Throttle body was replaced after it's gears stripped last year.
It's had more windscreens than brake discs!
Corrosion now taking its toll. I replaced the rear subframe a few weeks ago but the rest of the underside isn't to bad. Some bubbling around the front leading corners of the bonnet, the tailgate handle and the rear body panels where the passenger doors close.
What's it worth? Bugger all I suppose, but keeping it going is cheaper than buying anything of similar quality, though I am seriously considering a newer, low mileage FL2 . . . if I can find one at the right price.
When this one dies it'll be something major and someone can have it as a project for a song.