good luck with that. I had "increased emissions" turn out to be nothing early in my '05 545i life, but at 75k it meant thermostat, valve cover breather tubes, belts, vacuum pump, vlave cover gaskets, oil pressure switch, and upper timing cover gaskets...to the tune of $1,300.
2008 550i Carbon Black manual, sport, cwp, fold down rear seats, nasca leather vent seats, CA, HU, night vision
2005 545i, black on black, sport, prem, cold, fold down seats - sold
2005 545i, 6 speed MANUAL, black sapphire, auburn interior, sport, prem, comfort seats, fold down rear seats - deceased