BMW E60 mass air flow sensor replacement and values
Do you need to reset the adaptations after replacing the BMW E60's mass air flow sensor (MAF)?
It is not mandatory. The car learns the new sensor by itself while driving. If you wish, you can reset the learned values with a diagnostic program, in which case the car learns the new values faster. You do not need to go to a BMW dealer or specialist.
What is a normal mass air flow sensor reading on a diesel?
On a six-cylinder diesel the reading at idle should be about 500 mg or slightly above, so the control unit does not complain about leaks. At full throttle the reading should be at least about 1000 mg.
Is it worth replacing the mass air flow sensor before it fails?
Yes. Hot-wire sensors wear with use, and cleaner does not help. The difference is often only noticed when the old sensor is replaced with a new one.
Which mass air flow sensor is suitable for replacement?
The recommended option for the M57 engine in the 525d is an original-equivalent Bosch sensor. An aftermarket sensor's response curve may differ slightly from the original.