Product review (5 stars): Fixed my F51 error in 30 min. Excellent!
Excellent! As promised, packaged well, on time. Can fix F51 error yourself, just one allen screw and 4 bolts if this RPS is the problem. You can remove your sensor, which is the little green circuit board that sits in the black housing shown. I looked at my board & saw two traces burned up. I ordered this replacement, popped it in, now I'm up and running for $20. If you have an F51 error, watch the YouTube videos and then you can lean your machine back, unscrew the one allen screw and 4 bolts and look at your board. If you see a spot where it's burned, this new $20 sensor has a good chance of fixing your machine.