I bought my xj8 six months ago and have been fixing it since, the tensioners have been replaced and other than that I’ve just been scanning the car and fixing it. I just replaced the battery and an ignition coil thinking I was done. Below attached are the codes that popped up after being started after these replacements, I know the one just needs the car to go a certain speed to calibrate. I’m just wondering if these are now able to show because the recent replacements or if there’s something else causing these codes to pop up.

 

Check for an oily substance between the MAF and the electrical connector itself. Clean it with brake cleaner and dry with compressed air. Also check to make sure the pins of the connector aren’t backing out of the connector as you plug it in the MAF. If you have to, gently but firmly using a small flathead screwdriver, push the pins towards the sensor. Clean the MAF sensor up inside that black tube with brake cleaner and compressed air. I’d clear the code prior to starting it back up and see what happens.