High Pressure Fuel Pump. Make sure it has been replaced with the latest part number and you'll be OK. It's warrantied for 10 years/100K miles.
Originally Posted by aolling
Considering a 2009 Z4. It's the first year of the 3rd generation Z. Any first year problems that are common?
2006 525 xi, Orient Blue Metallic, Beige leather, Dark Poplar trim, Premium Package, Cold Weather Package
2012 Z4 35i, ED 2/24/12, Melbourne Red Metallic, Black leather, 6 MT, ///
M Sport, Premium Package, Premium Sound Package, Cold Weather Package, Nav, Comfort Access, LED Angel Eyes, BMWPedals pedal covers, stubby antenna, Luxon strut bar, CF engine cover, LCI side marker, powder coated calipers, Extra Enjoyment Package