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Biiiiig question - many others will have their opinions but speaking from my personal experience over the last year:-
Cheap OBD2 readers - only of limited use as they generally only read generic codes, no ABS etc.
Laptop/PC - there are some setups out there that can look deep down into Jag. specific modules. Depends on your price bracket, approx 100 euro for SDD/mongoose-cable clone. I bought one but got fed up with the unintuitive interface, and the fact my laptop couldn't handle the virtual XP etc. Result, dog-slow operation and frazzled patience. Others have had more success with it though!
AutoEnginuity make a comprehensive Jaguar system but at a price. Latest software seems to be causing some problems apparently.
Hand-held unit - I bought a Foxwell. Does the job with Jaguar ABS etc but also covers my other cars as well. Handy for carrying in the car.
Andrew
Last edited by multiplecats; Jun 3, 2015 at 09:37 AM.
So you advice better buying a complete Diagnostic-System instead of cable and software?
XP Pro on our Laptop is no simulation, its real XP :-)
For the home mechanic it really boils down to two things, price and convenience. Once again I can only advise on personal experience but I found the laptop option a bit fiddly. Balancing a delicate LT on my knees with the wind blowing and rain coming down was not ideal. (My Jag lives outside).
The Foxwell is a rugged device which can stand a few knocks, blows, showers etc. Also in my case it up and running in less than a minute. The SDD option took a lot longer to use even after you've fathomed out the less than intuitive software.
To my (limited) knowledge there is no one-does-all box in our price bracket. I will stick my neck out and say you probably might end up with 2 (or more) devices!
Think about what you really need - if you want the ability to activate control functions on the car then the LT option might be better.
If you just want to drill down to modules and get the Jag DTCs then a mid-range handheld maybe all you need.
Bet you end up with both
BTW the SDD I bought could only run in the supplied VMware environment which you can't bypass. There are probably other native XP versions out there - I don't know. If you're good with software you can probably make it work.