just replaced MAF and was told i need the lean mixture valve....( which i have not done) anyway the serivce engine light comes and goes, now just recently the abs, service engine, brake, ABD, and DSC all light up and the speedometer stopped working.......truck runs great tho...wondering what could be the problem this time...thus far this x5 4.4 at 59k has really let me down...i am used to german reliablity but this x5 is a POS.