There is no BMW software that does anything with the ISN, besides the first time DME to EWS/CAS pairing (on virgin DME or virgin EWS) The EWS/CAS and DME/DDE stored ISN must match, or else the car will not start. Newer cars’ ISNs use a starting code that is stored in the DME (or DDE if a diesel car) and then change the code (rolling code) with each successful engine start. ISN is not a software, but rather it is the immobilizer key code that the EWS or CAS module (the immobilizer security module). Search for a local, independent BMW repair shop with BMW mechanics that have dealer-level expertise at a fraction of the expense.Here is all about BMW ISN (DME DDE EWS CAS). If you encounter any of these common problems among the e90 3-series of BMW, contact an independent repair shop for diagnosis and professional solutions.

This could be due to a defective steering column, computer problems, or other issues. A defective EGR thermostat or faulty glow plugs could results in a temperature as low as 68 Celsius and much lower MPG.įaulty Steering Wheel Lock: There have been instances when owners go to start the car, but the key won’t turn and the dashboard illuminates the steering lock symbol. But even drivers that care meticulously for their engines may experience turbo failure between 65k and 100k miles.ĭefective EGR Thermostat and Glow Plugs: Average coolant temperature should be about 90 degrees Celsius which translates to an average 35-45 MPG for city driving. This happens in first or second gear normally.įaulty Turbo Engines: It is best to let a turbo engine warm-up before driving to prevent any undue wear and tear. Rattling Noises in Cabin: Owners have complained of a variety of rattling noises in the cabin of their Bimmer, typically around 4000 miles, but sometimes as soon as a few days after purchase.Ĭlutch Juddering: Another problem that occurs around 4000 miles (or more commonly around 100k) in manual transmission vehicles is a juddering in the clutch. Here are some of the common problems in the e90 series manufactured from 06-12:

Some of these problems can be prevented by adhering to the recommended maintenance schedule, but some are manufacturer defects which need to be addressed by an independent BMW repair professional. All vehicles have inherent faults and the BMW e90 three-series is no different.

Bmw e90 delete error codes inpa