To build on what others here have shared;
As a recent purchaser of a used CRD back in July with 139k on it I thought I was getting a good deal since the price was below 7k. I sure wish I had discovered this list and read about all the problems before I made the deal.

After buying this Jeep and learning about all the things that it needs it became a big investment. I could not find out for sure either from the dealer or previous owner if anyone had ever put a timing belt and water pump on it. I could not sleep well at night for worrying about the belt breaking.
So, I started pouring money into it!

Blocked off the EGR, removed the CCV hose from out of the intake boot, removed the CAT and replaced the muffler with a Flowmaster, installed a Diablo Power Puck, replaced the timing belt, idler & tension pulleys, and water pump ($600 in parts Ouch!). Pulled and cleaned both the intercooler and radiator, replaced both boost hoses and clamps with Samco’s (another $300) Ordered all new Bilstein shocks this week, getting ready to order new springs front and rear to go with the shocks. Have not even gotten to the torque converter, rockers, glow plugs, and / or head studs yet. Will have sunk well over 4k in this thing before it is all over in just parts alone!
Moral of this story, be
very prepared to spend a lot of $ on one of these used vehicles. And if you cannot do your own mechanic work, FORGET IT, unless you have lots and lots of $ to spend. As others stated, very few mechanics out there that really know how to make these things tick.
I keep asking myself, what the heck have I gotten myself into!!! I should have just bought a newer Jeep Wrangler.
Sure love this little Jeep and torque though! Would buy a new one tomorrow if it were available.

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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve