I go to Jeff Wilson (Wilson Enterprises) in Brea. N old school guy who does lots of stuff on many cars including Jags. He got me through the pre-sale smog test for my '76 XJS and lots os things on my '13 XK.

A bit far from you, but you might consider MetroLink and Uber back and forth to the station ... might be the one at La Palma and Tustin Ave in Anaheim.

 

I now recall the MetroLink coming from Riverside swing south to Orange and DO NOT go through the La Palma/Tustin station. You could go on to Orange and catch the next northbound train which stops in Fullerton. It's a bit awkward but might look good depending on your other options.

 

Elite Auto repairs and Parts

They specialize in JLR cars

https://www.yelp.com/biz/elite-auto-parts-sun-valley-10

I went here when replacing my 2013 Jag XJ engines. They are very knowledgeable about Jags issues on each generations.

 

Livin 1.5 hrs from JLR Las Vegas is sweet....Wife n I do a 3 day party vacation each service. I'm up 187.5K!! I do need a reputable Service Tech for my 2017 F Type V6S though.

 

Had a great experience with Essex Imports in Salinas, CA. Former colleague of my previous Jag Shop (Craig Nelson) in Portland.
Both Jag Master Techs, 30 years in business.

Shop's nothing fancy, but he's always busy, works on a variety of high end makes, knows older Jag's well, services many locals who show at the annual Concourse, does good work at fair prices, and his British accent is fun too.