2008 BMW 135i Coupe: Going In For Service Soon
July 08, 2009
We have yet to observe another occurrence of the non-start issue in our long-term 2008 BMW 135i coupe. However, a pattern has emerged: If the car has been sitting for a while, we're looking at extra crank time before the engine will fire up. It happened when I left work last night and again this morning in my carport.
After reading your comments regarding the known fuel pump issue with the N54 engine (i.e., the direct-injected and twin-turbocharged 3.0-liter inline-6 in our 135i), we've decided to make a service appointment.
In addition, we ran across this TSB dated April 2009 that apparently covers our 2008 135i. It starts out, "BMW has become aware of a potential problem that could affect the durability of the High Pressure Fuel Pump (HDP) of certain MY 2007/2008 BMWs with the N54 engine."
The bulletin continues, "Vehicles affected may have the Service Engine Soon lamp illuminated with various low fuel pressure-related faults (e.g., 29DC, 29F1, 29F2 ) stored in the Engine Control Module (DME). Also, the affected vehicles may experience an extended engine starting time ("long crank") or reduced engine performance ("engine failsafe mode") when the High Pressure Fuel Pump malfunctions."
A fix for the problem is detailed in the TSB, right down to the part numbers. In addition, the bulletin says the emissions warranty on affected cars is extended to 10 years/120,000 miles.
Erin Riches, Senior Editor @ 24,064 miles