[h=2]Common Problems[
edit][/h][h=3]HPFP Failure[
edit][/h]In at least the US market, the N54 engine has been characterized by a very large number of High Pressure Fuel Pump (HPFP) failures,[SUP]
[27][/SUP] leading to BMW North America vehicle Lemon Law "buy backs" and reduced customer goodwill.[SUP]
[28][/SUP] BMW's failure to solve the HPFP problem has led to serious safety concerns over dangerous sudden losses of power at highway speeds.[SUP]
[28][/SUP] Reports of drivers being stranded are not uncommon and some have accused BMW of actively concealing the problem rather than addressing it.[SUP]
[28][/SUP]
In April 2009, a class action suit was filed against BMW in connection with HPFP failures.[SUP]
[29][/SUP] BMW settled the suit in June 2010. On 26 October 2010, following an ABC News story about HPFP failures,[SUP]
[30][/SUP] BMW announced a recall of vehicles with the pump in question from manufacturing years 2007-2010.
[SUP][31][/SUP][SUP][32][/SUP]
BMW in Europe have not had to purchase cars under Lemon Laws as they have in the US market.[SUP]
[33][/SUP] In the US BMW have extended the fuel pump warranty to 10 years,[SUP]
[34][/SUP] BMW Europe instead have left owners unsupported with no extension to warranty or goodwill gestures.
The N53 engine shares the High Pressure Fuel Pump with the N54 series of engine and has suffered from the same problems, although these engines were only sold in Europe.
[h=3]Turbocharger Failure[
edit][/h]The N54 turbochargers have been known in at least the U.S. and Canada to suffer from premature wastegate bushing wear which results in an audible wastegate rattle noise. If the wear is severe enough the wastegate will not seat properly resulting in a loss of boost pressure and trigger engine fault 30FF which temporarily reduces power output. BMW North America (which does not manage the Canadian market despite its name) recognized the design flaw and extended the warranty period for US vehicles to 8 years/ 82,000 mi for wastegate related issues only.[SUP]
[35][/SUP] BMW Canada (which does manage the Canadian Market) does not offer any relief for turbocharger wastegate rattle issues in Canada beyond original warranty.
[h=3]Direct Fuel Injectors[
edit][/h]Direct injection is used within the N54 engine. Injector failure is a common, causing either rough running, engine faults or general loss in power[SUP]
[36][/SUP].
[h=3]Carbon Build-Up[
edit][/h]It has been widely reported that the N54 intake valves experience build-up of oil and gasoline deposits (carbonizing). The buildup of a black carbonaceous deposit on the valves can, over time, cause reduced power and has been linked to misfiring.
[SUP][37][/SUP][SUP][38][/SUP]
[h=2]Extended BMW Warranty[
edit][/h]Due to many quality failures by BMW, they have been forced for the USA market to extend the warranty on the High Pressure Fuel Pump and also the Injectors to 10 years. [SUP]
[39][/SUP]. Owners in other regions are left without support.