Recently notices my rear differential gasket leaking and also a bit of light popping up that include, cats system fail, battery warning, tpms failiure. The car ran amazing but is turning into hell for me. Sorry if I’m being out of pocket but are there any Jaguar mechanics here in Colorado willing to help me get my XF supercharged back to shape

 

Cats can get clogged up from running a rich condition (too much fuel). The rear diff gasket is probably pretty easy to replace but I have not done it personally.

Post the codes you're getting and any other symptoms. That will help.

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Jag codes

P0620

P010B

P0174

B11DB

P0128

P050B

 

with CATS he means the dynamic suspension not the catalytic converter.

Find a local independent mechanic specializing in european imports. Have them install a new battery, a fully charged high quality unit and use a scan tool to follow a replacement routine. This will take care of most of the errors. The diff seals last about 10 years on these, have them do all 3 before too much oil leaks out.

Once sorted you can decide if you still want a maintenance hog in your life or sell it on. All the other euro lux brands are the same if not worse.