BMW 335i N54 Twin-Turbo · 2008
Hard starts that need a long crank before the engine catches, along with hesitation under load, point to the factory high-pressure fuel pump wearing out - a widely known issue on early N54 twin-turbo engines. BMW extended warranty coverage to 10 years/120,000 miles on the original owner in the US for exactly this part, so it is worth checking eligibility before paying out of pocket. Past warranty, aftermarket HPFP replacement is a routine, well-understood repair in the N54 community rather than a rare or exotic fix. It is a drivability issue more than a safety-critical one, but it does not resolve itself and tends to worsen gradually.
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