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Hi guys. Sorry for resurrecting this thread. I recently had a ‘drivetrain error’ on my idrive on my 640d. Fault codes showed to be issues with dpf and dpf backpressure sensor and car was also in limp mode. The Backpressure readings were extremely high (200hpa) on idle and around 750hpa on 4000 revs before changing the sensor and after changing the sensor idle was down to 20hpa and 70hpa when at 4000 rpm. These are readings when the car is stationary in park. I believe the second readings are normal however when im driving and ‘flooring it’ does anyone know what readings should be showing? At one point I saw a reading of 400-600hpa with foot planted. Is that normal? Does anyone have any idea of what what normal differential pressure readings must be. Car is driving fine now but unsure if my backpressure is still high when boosting.
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