Question about 2007 BMW 525xi Sedan

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My 2001 525td starts and drives ok but intermittently it wont go above 3000 rpm,if you stop and switch it off it goes ok again for a short while

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HI, your car is most likely going into limp mode. The number one cause of this computer shut down restriction- is a Mass-Air Flow sensor malfunction. Fuel trims become erratic and the engine computer puts a order in to limit performance until the original problem is resolved. The fact that you can get performance back after shutting down car and restarting is that the computer is rebooting and most likely the sensor is now functioning properly and or has not set the number of faults required for limp mode. What I would do is have someone with a scanner look for DTC's or engine problem codes, and remember the following: Lean or Rich fuel trims detected bank 1 bank 2 (is a Mass Air flow problem)Replace Mass Air flow sensor assembly. Accelerator position high or low and or erratic is most likely (Pedal sensor) Replace Pedal assembly. Good Luck.

Posted on May 18, 2011

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