Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
What year is the Jag? With all that running with no alternator charging the system its most likely low voltage codes and will clear over time.
I still think its related to low voltage. when was the battery replaced last? XFs are really sencitive to low battey voltage. Normal life with a good battery (interstate) three years.
Replace it, Drive it, and Love it......Its a Jaguar
The light will remain on untell you complete a full drive cycle.