The 8 Most Common BMW N54 135i, 335i, 535i Engine Problems 1. High Pressure Fuel Pump Failure (HPFP). You guessed it, the N54 high pressure fuel pump is responsible for injecting... 2. Turbocharger Failure & Wastegate Rattle. While the high pressure fuel pump failure might sound like a disaster,... ...Is the 335i E90 a good car?
2008 335i E90, absolutely no problems. Could not ask for more from this car. "i Drive" is wonderful, although it has a learning curve. I think at 4 months, I am just about aware of all the functions. The bad press this gets is really lazy people not putting in the efffort to learn.Why do turbochargers fail so often?
Over time the actuator and rods of the turbocharger wear down, resulting in rattle and boost control issues. In this case, running higher levels of boost (psi) on your turbochargers will likely increase your chances of Wastegate failure. Yes, this means running a JB4, Cobb, or PROcede tuner will increase the likelihood you blow your turbo’s.Can a tune cause a BMW HPFP to fail?
BMW did have dealers recall HPFP’s with certain manufacturing codes, which suggests that it might be related to bad manufacturing batches. Running a tune, such as the JB4 or Cobb, will not increase the chances of your HPFP failing. Nor will any other performance part for that matter. Stock and tuned N54’s have both experienced these issues.