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have you got any fault codes out of the system? the normal cause of poor running and misfires are the on plug coils. the cat system will report a a misfire to the powertrain control module and that will flag a fault code for a cat problem. check the resistance of the spark plugs because if they are too low they can damage the coils and spike the powertrain control module.we used to change 6 plugs and coils for this very problem, very expensive. the lambda sensors are also troublesome, bank a easy, bank b, good luck. change the plugs and use jag recomended. the fault codes are the key to sorting it out
"The message relates to the CAT(S) system, (Computer Active Technology Suspension), which changes the shock absorber settings front-rear and left-right between Soft and Hard based on inputs from various motion sensors."("2004 Vanden Plas air spring replacement - Jaguar Forums - Jaguar Enthusiasts Forum," n.d.)
replace the rear o2 sensors, or beat on the cat.. if it rattles inside there, it is the bad part. If the cat is bad, then check the engine out for the general state of tune. This is because if the engine is not running perfect, then the cat will take all the abuse.
Cats was a optional extra from the factory. It is adaptive damping. It basicialy softens or stiffens the shock absorbers to your driving style.
It may seem that one of your shock absorbers has developed a internal pressure fault. A local garage with a code reader can tell you wich shock absorber to check. Would be worth checking the electrical connectors that plug into the top of the shock absorber to make sure they are not damaged.
Code PO430 could be = catalyst efficiency below threshold bank 2 ........ this may be caused by faults in combustion and if you have just completed repairs it may rectify itself as the car runs correctly ...... do not leave as a fault for too long as damage will occur to cat/conv.