Just picked up 2013 Jaguar XJ Supercharged
One owner car 85k miles . Black with black interior
Before going all out and doing performance ECU tune like my other Jags I Decided to run some diagnostics scans. Found out that idle fuel trims are +30 for both banks which is far from normal comparing to Denso 4.2 and 5.0 Jaguars. Can anyone confirm please? There is no check engine light codes but historic codes, photo attached...Also another issue is musky smell from vents , maybe I can get some input there as well as to how remedy this.
Apriciate it!

 

At trims of +30 you should have (trim-related) codes!

If you haven't, I guess you choose between
1. bad tool, not reporting properly
2. some reason why codes can't flag e.g. OBD monitors are unset so can't flag the relevant codes
3. er, probably some more reasons

#2 should be easy to look at, #1 means try another tool I guess

 

Looking at historics would suggest your intake air sensor has gone belly up and thinks you are in the arctic. Hence supplying extra fuel. You should be able to monitor that on your reader.
Of course the old vacuum leak scenario raises its head also.

 

It's definitely not the monitor
Confirmed with JLR SDD dealers diagnostic, same thing high fuel terms, yet no check engine light codes which I can't figure out. All emission readiness tests pass just fine. I cant find any visual vacuum leaks. Thinking it might be maf sensors but then both of them failing at the same time is probably unlikely

 

Just bear in mind that this is the forum for the XJ model before yours. There is a specific forum for your XJ model in the Current Jaguars listing