I had this earlier in the year, twice in 6 weeks. Took it to main dealer in Chichester who informed me I needed a new NOx sensor and SCR Catalyst and Jaguar Warranty had rejected the claim as the exhaust was not covered. Paid over £1800 and then I phoned the warranty company to ask why the claim was rejected and they told me it should have been covered but the dealer had not included the NOx sensor in their submission and if that had caused the SCR cat to fail.
Couldn't take it further as the dealer had binned the original parts and refused to refund me any money as "we wont get back from the warranty company what we charged you" (quote from Service Manager)
Warranty company eventually refunded me £639 direct to me
