SOURCE: I have a 2003 Jaguar
SOLUTION for x-type Transmission fault error
I had this very same problem. My 02 x-type would get transmission fault code and then shut down into limp mode. If I turned the key off, shifted gears a few times and waited I could start up again and sometimes drive for several miles before the code came back. GOOD NEWS, I thought maybe the vechicle was overheating the tranny or something like that and then after it cooled down I could drive some more. I discovered that my gas station had switched to the 10% ethanol addative about the same time I started experiencing "strange" mechanical issues. I decided to try switching my gas to the non-ethanol gas from a Phillips 66 station that advertised 100% REAL GAS. The problems mysteriously dissappeared!!!! Remember that you MUST use PREIUM gas as per the MFR. Well the 02 3.0 can't handle the 10%ethenol in it's gas. Something else you can try if you can't find REAL GAS is to use the OCTANE boost from your local auto parts store. Pay close attention to which brand you buy since some can harm your fule system. As a side note; I also own an 04 s-type with a 3.0 under the hood. It looks different from my 3.0 and has no problem running on the ethenol added gasoline. However after the horrible mechanical experience I had with the ethenol in the x-type, I now use 100% real gas in both. I have been transmission fault free for 5 months now.
SOURCE: Jag S Type won't start,alarm sounds lights flash fault messages
try taking the negative off the battery for 20 secs then put it back on and try it
SOURCE: Cruise control unavailable--x type Jaguar
I had the same problem and found that the PCV breather hose was leaking, creating the vacuum leak. The codes for the error have translated to "bank 1 too lean, and bank 2 too lean." Start with the PCV breather hose and see if that doesn't fix it. You will also have to reset the computer afterwards to get rid of the error.
SOURCE: x type jag, gearbox fault on dash, runs ok
You need to go to your local auto electician,to plug in scanner
This will locate fault before it gets worse
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