:helpok so me and my dad pulled the codes from the 8 with the bavarian autosport code reader... The code "C9" came up which is emission (lambda) control so we hallowed the cats and changed the 02 sensors however the car still has no power at all and the passenger side exhaust is hot but the driverside is cold....THE CHECK ENGINE LIGHT IS NOT ON...does anyone have any ideas.....its a 1991 850i..hhowever our guess is one of the fuel pumps thanx guys:)

Could be a fuel pump, Check for pressure on the opposite side of the cool exhaust, Your in limp home mode right now, Could be a number of things, Bad coil, Pump, Maf, DK motor, ecu, sensor.....