I tested my AFM on my e28 (which is L-jet but don't worry about that) and it gave me inconsistent readings testing it with the multimeter. eg along its door travel would go along normally until bam it went to infinite resistance then normal then bang infinite resistance repeat until the end of the travel. so every so often it'd spike but all throughout the travel of the door there were these "spikes".

From the looks of the carbon track the substrate had worn right through to the layer of the board. So anyway we sent it somewhere to be fixed and low and behold when we got it back it was still the same. So we said well, it ain't fixed.

The guy then told use some **** about the reference voltage that the multimeter uses not being large enough to get a decent resistance and that we should test it using the voltage supplied through the pins. personally i think he's full of it and also my car ISN'T FIXED i still have the same BS surging crap that is mostly likely due to the AFM being worn out.

Now my question is: is this a common sign that its screwed and does this guy have a point? I have a warranty and if its still rooted I want to get my money back (because these people were a bunch of d*ckheads who didn't even consult us before starting when we wanted a quote.)

If anyone who has experience diagnosing a worn out AFM can chime in with their experiences.