Hi Steve, I believe its on properly, the guy in the garage thought that because the air sensor is on the inside of the bend, the aur flowing past it sometimes causes the sensor to think something is up but all the ones you can by online from the £13 basic ones to the k&n expensive ones are all exactly the same. I should mention that everytime it has gone into limp mode the glow plug sign on the dash was flashing?
Thanks
Jack