Here's a doosey. 2 weeks ago car goes into limp mode and poor engine performance message appears as well as check engine light. In the beginning it was sporatic but then quickly moved to always being in "limp" mode. Changed plugs and it went away for 20 minutes but then returned. So we brought it Jaguar dealer and they found the code for "Ignition Control Module - 2". They replaced and car was fine until the end of the test drive where it went back into limp mode. They kept the car for 2 weeks and have now given up - recommendation was that it could be the ECM - but not really sure (pretty sad). Well we brought the car home and started checking fuses, relays, grounds, etc. thinking they probably haven't been moved in 13 years - we also swapped some of the relays that were the same,..... well don't you know for the last hour of driving it's been almost fine - on two occasion the "Poor Engine Performance" light came on, car went into limp mode and just as quick came back out. Thoughts .... were really stuck? Thanks in Advance.

 

I have similar issues with my 97 Xk8, similar warning codes. I did not deal with dealer because of what you experienced. I took it to a loacl European repair shop. They thought it was a throttle body issue. Two used ones, same results. So mine sits in the garage for the winter. For all the sensors and the like on here it is funny how hard issues are resolves on these cars.

 

double posting bad