Hello,
Hope I have the correct thread, new to the site. I have a 2004 XF that once it reaches operating temp and is idling the car dies. Started out to being intermittant then proceeded to get worse with no hard fault registered (i.e., service Engine light would come and go). Now the car doesn't want to start until there is a significant lowering in the engine temp. Have received a constant Service light with P0412 code. Have been reading a number of posts with this issue and all point at the Relay Control board, I have pulled the Relay Board and have done a visual inspection and all solder joints look good and all the relays look good i.e., no pitting or corrosion. Started the car today and let run heard the Air pump running for a few minutes then shut off, car continued to run, then when the engine was just about at operating temp I heard the air pump kick on for just a second or two and shut off, about a minute later the engine died and would not start. Anyone have any feed back on this. Just dont want to spend money on the Relay board to find out it isn't that.