Have a 2017 V6 R-Dynamic RWD low mileage (30,000) with zero mechanical issues until now.
Went in for its 60 Month / 80,000 mile service in April to a Jaguar Authorised Dealership passed MOT with no issues
Within 2-3 weeks car started misfiring with Engine Warning Sign coming on - returned to dealer
Dealer reported one of the spark plugs fitted during the service was faulty ('cracked') replaced it and that car was now running fine
Within 2 days recurrence of the misfiring and returned to dealer who then diagnosed 2 x faulty Catalytic Convertors quoting £4k job to replace
Cutting a long and frustrating story short I wasn't standing for what the dealer was telling me and had to convince them and Jaguar Head office that something else must have been causing the Cats to fail at this age of vehicles - took weeks to convince them of this !
Eventually got the original diagnostic codes as follows:
P0236-85 turbocharger/supercharger boost sensor A circuit range/performance- signal above allowable range.
P0420-00 Catalyst system efficiency below threshold bank 1 - no sub type information.
P0300-00 Random/multiple cylinder misfire detected - no sub information
Jaguar have been guiding the dealership on series of test with the problem remaining undiagnosed - next step is they are stripping down the cylinder head as they are now saying there is a loss of pressure across a whole bank of cylinders (not just one)!
I'm not a technician but have been taking some independent advise that this whole saga is really strange - convinced that something the dealership did when in service has created this
Attitude of main dealership whilst this has been going on is unbelievably bad and obstructive which make me even more suspicious of what has gone on. Trying to keep Jaguar UK Head Office onside in order to maximise chance of financial contribution to whatever mess I am left with despite it being out of manufacturer warranty
Would really appreciate guidance from those more educated than me on the subject and what levers I could pull for more support
Went in for its 60 Month / 80,000 mile service in April to a Jaguar Authorised Dealership passed MOT with no issues
Within 2-3 weeks car started misfiring with Engine Warning Sign coming on - returned to dealer
Dealer reported one of the spark plugs fitted during the service was faulty ('cracked') replaced it and that car was now running fine
Within 2 days recurrence of the misfiring and returned to dealer who then diagnosed 2 x faulty Catalytic Convertors quoting £4k job to replace
Cutting a long and frustrating story short I wasn't standing for what the dealer was telling me and had to convince them and Jaguar Head office that something else must have been causing the Cats to fail at this age of vehicles - took weeks to convince them of this !
Eventually got the original diagnostic codes as follows:
P0236-85 turbocharger/supercharger boost sensor A circuit range/performance- signal above allowable range.
P0420-00 Catalyst system efficiency below threshold bank 1 - no sub type information.
P0300-00 Random/multiple cylinder misfire detected - no sub information
Jaguar have been guiding the dealership on series of test with the problem remaining undiagnosed - next step is they are stripping down the cylinder head as they are now saying there is a loss of pressure across a whole bank of cylinders (not just one)!
I'm not a technician but have been taking some independent advise that this whole saga is really strange - convinced that something the dealership did when in service has created this
Attitude of main dealership whilst this has been going on is unbelievably bad and obstructive which make me even more suspicious of what has gone on. Trying to keep Jaguar UK Head Office onside in order to maximise chance of financial contribution to whatever mess I am left with despite it being out of manufacturer warranty
Would really appreciate guidance from those more educated than me on the subject and what levers I could pull for more support
