Hello, I had to change my cooler 6 months ago and also immediately renewed the glow plugs and STG. I removed the air flow from filter, turbo, turbo cooler to AGR and air collector. After about 4tkm now after a fast highway trip I had turned off the X3 and left again after 30 minutes. I already noticed that from 2,000 rpm a strange noise occurred, as if air was pumping out at a leaking hose connection – “unfortunately” only under load. N Ach 5 Min has also approached the motor lamp, error memory says P3264 (seemingly air mass or air quantity flow rate (bank 1)), In the stand one hears nothing. I would say when driving there is hardly noticeable power loss. Have had the cover down and made a visual check, unfortunately nothing found. Can one limit on the basis of the error number, which hose is apparently leaking or at which place? Are there recommendations for troubleshooting or to the procedure? + Best regards Tobi