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Q: Catalytic Converter on 2003 Jaguar S-Type

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
How can you tell if it is bad,my engine light is on also Gearbox Fault is lite up in the message box alternating with flashing message Restricted Performance
(1) Answer
You probably can't tell if your catalytic converter is bad, if you had the experience and tools to tell, you wouldn't need to ask. Get the warning lights diagnosed by a Jag specialist, ASAP... Save yourself some money and misery by getting it checked now...
The check engine light indicates that the computer has detected a malfunction in the engine/transmission control system and has diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner can access the diagnostic codes and data and then be able to give you a diagnosis.
If you want to find a specialist, here's our directory link for you:
https://repairpal.com/directory?address=19153&car_brand_names=Jaguar