The L322 is an awesome machine....but.....the early ones are beset with issues.
All the above is all sound advice, the Diesel will eat its gearbox at some point so budget around £2.5K for a replacement with a Sonnax valve block.
The electrical gremlins are profound with such a complex car, but what surprises me is that the same systems are found in 1996-on BMW's so why it wasn't all sorted out by the time the L322 was launched in 2002 astounds me! But it does mean that most faults are well documented on here, other Range Rover forums and also on Bimmer sites!
The TD6 is a very good power unit with only injector and turbo hose issues that crop up most of the time, the odd HP Fuel pump issue, but rare....most common is the secondary in-line fuel pump mounted on the side of the fuel tank that fails!
Best to check to see if the engine oil breather has been changed, as I believe it can cause issues (check with 2.0_Hippo)
I have both an L322 and a P38.....comfort, hmmmm the L322 is a more relaxed drive due to the oodles of power available and the more 'car' like handing....but, the P38 is a much softer more cushioned ride....
As with most BMW derived products, the spec list for the models can vary as they are just a kit of parts and an options list....Vogue was the top standard model in 2002-2005 but even then, the spec can vary greatly between them depending on what the original owner wanted...I have seen genuine Vogues without the Sat Nav, or with Sat Nav but not DSP...etc...
Best to ignore the name, and go for the one with the toys you want in it!
The Mk3 Sat Nav is basic but functional, upgrading to the Mk4 is simple and worth it, but is still now looking dated when compared to others and even to what you can get on your phone now-a-days!
The TD6 is plenty pokey enough...you can get them chipped, but budget for that gearbox sooner in that instance.
Regular Gearbox oil and filter changes are a must to try and prolong the inevitable...but it will happen at some point!
They are not as solidly built as the P38 (which was arguably the best screwed together and rust proof Range Rover ever!.....electrical issues aside that is!) and they are starting to show rust signs on wheel arches and tail gates (sound familiar??
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They eat suspension bushes, especially the rear due to its fat ar$e, and they can be a pain to change, but if you can wrangle a spanner with confidence then it isn't so bad.
The EAS system is just as temperamental as the P38....but just like the P38, keep up on maintenance and sort issues promptly and it will be fine...the main weakness is the plastic valve block...I mean plastic...WTF were they thinking of!??!
They will throw a fault just because...for no reason...so your own diagnostic gear is paramount if you want to save trips and money to a dealer/indy.
Many available....muts nuts Faultmate will set you back £1000 or so, but is ultimate...
RSW All Comms is the most capable at the budget end, IIDTool by GAPDiagnostics is great, but uses the message centre display for readouts..so if that is fecked your stumped.....Bearmach Hawkeye has mixed reviews and can't do EAS Calibrations.....Lynx by Omnitec/Britpart little known about it, but reports are reasonable to those who have used it....
Pity Blackbox Solutions never did and looks like they won't do a Nanocom for the 2002-2005 L322's....if they did I'd be the first to buy one! (although my L322 still won't talk to diagnostics following a HID/Bi-Xenon bulb failure)
Remember the Golden Rule to buying a Range Rover - Never, Ever buy one with faults unless you are prepared for and understand the potential costs, frustration, time and head scratching that is involved in repairing it!
Complex, expensive, powerful, comfortable, unreliable, sublime, frustrating, annoying, beautiful etc are all the sorts of words I would choose for the L322.....would I be without mine despite all the problems I have had? No, I love it regardless.....if you can accept its faults, you'll love it.....
If you are after something more reliable and dependable....you'll hate it!