2005 XJ air suspension issues - conversion to coils

[NickStratta]

Hi All, Greetings from Ireland!
Long story but over the past 3 years I've struggled with the air suspension on my 2005 XJ Sovereign, standard wheelbase. Firstly a compressor replacement, then a front ride height sensor and 2 front air springs in January 25 because in Ireland here for the roadworthiness test they do a side to side measurement on the shock absorbers to check they are in balance (30% imbalance is the fail level) and last month 2 rear ride height sensors because one was throwing a fault code and the car sitting 1" to 1 1/2" too high. Sensors fitted but still too high and after deflating completely took 8 hours to reflate and is now still too high. Then last Friday a loud bang and we thing the left rear bag has blown out. The front springs were aftermarket (probably Chinese) and admittedly cheap but rode hard when installed. I have been told that aftermarket air springs can cause spurious faults with the air suspension system but I'm not buying OEM Jaguar front ones at horrendous cost.

So essentially I've had it with the air suspension and want to fit the coil replacements. I've driven myself distracted by researching on the internet what to replace them with. All of the options seem to be US or Chinese based - are their none in Europe to buy?

I know there are numerous posts on this in all forums but a lot of advice stretches back 10 years sometimes and I can't find any recent 'where to buy' recommendations.

I don't want a super duper set, just reliable old springs and the ability to switch off the air suspension warnings for the roadworthiness test (any orange light or dashboard warning is a fail condition here in Ireland). It's a 2005 MY.
I'd like it to ride nice and comfortable, it's not a corner carver or a track machine, I've Bridgestone Weather Control A005 EVO 235/50 R18 101V XL tyres all round if that's relevant - it rains a lot here and it rides nice on those. But I have to say I do see the value in a set with adjustable damping/ valving and spring height - if it isn't going to cause the Jaguar to fail inspection as a too-modified car.
All advice gratefully received please! Thanks Nick

[Big John]

Hi Nick

Without recoding: https://www.autoreservejaguar.com/xj-x350-2003-2010-coilover-shock-spring-kit.html

or cheaper alternative: https://www.ebay.co.uk/itm/354203796871?_skw=xj+spring+conversion&epid=7047144579&itmmeta=01JY7827ZCFRRN10CAVGKSP7N6&hash=item5278310587:g:lcoAAOSwvsplTgNR&itmprp=enc%3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1eRTia%2B9aXD0yOY1pn5M6%2BFIttb1D%2B9WdyOqBcaijPmuGnIU7KZeYD44jmO%2BkhsJZAisvmn4GPpG%2FBs16ViWgdd7ivgKFeV3YLU1SAuEpqtdPTitkPuqtBs9e0Fr7mjR8bB8DcbWvXRVgvp5ZKpIBAE5WLo3LsFxjw2VRZMrWGOEcHlPlB5HKJjtmqIS4XYFeA4GdYlbbehvKqE7pJn5PmZply6rb6snez8NrhjgiNsSAlrAcdgFe80kI51wqedLVY%3D|tkp%3ABk9SR_r_iOjxZQ

or this kit claims to include a module to sort the electrics as well... https://aeropik.eu/item/1929#:~:text=Arnott's Coil Spring Conversion Kit for the,kit also includes Arnott's patented (US Pat.

Good luck

John