Thanks a lot for your video, after checking the handle and the hall sensor, nothing seemed wrong with it for me. What fixed error 140 (N1S 2017) for me was disconnecting/reconnecting, cleaning and spraying with contact spray the big white plug that goes into the motor controller that is located under the seat/trunk. You have to remove the trunk (4 big screws) to access it, it is pretty easy. As a lot of members of myniu already said, I suspect bumps on the road, and also the central crutch "hard springback", to loosen the connection between the controller and the plug... I try to use only lateral crutch and to be gentle on speed bumps now, hoping the error doesn't reappear. FRA : Comme sur la vidéo je n'avais pas de problème au niveau de la poignée, et le potentiomètre d'accélérateur semblait sans aucun problème mécanique (c'est le "hall sensor" dans la vidéo). J'ai réussi à faire partir l'erreur 140 en démontant le coffre (4 grosses vis) et en nettoyant avec du spray à contacts le gros embout blanc du cable qui se branche sur le controleur de moteur (il est fixé au cadre sous le coffre). Je pense que les ralentisseurs, mais aussi le "retour fort" de la béquille centrale quand on en ressort le scooter, ont tendance à créer des faux-contacts au niveau de ce connecteur... Maintenant j'utilise que la béquille latérale et essaie d'éviter au max ralentisseurs et autres nids-de-poules, en espérant que l'erreur ne ré-apparaisse pas.

I bought NIU N1s and went to service after 840km. After that I had a similar problem to my N1s although the warranty period is not expire. My moped used just for 6 months 2600km with error 140. Service + Repair cost 300usd. .... Chinese quality... Nerver buy NIU....

Great video myniu. Just been shopping, loaded the box, turned the key, it went through the checks and ended up with gear 1 locked, cant remember if thats normal, probably. Pressed green button nothing, waited repeated a few times, nothing, though for a split second I saw code 140 in tiny digits at the top of the screen. Unplugged the battery a couple of times, nothing. Started walking it home, thought Id recheck after a few hundred yards and voila., it worked, The alarm did come on for no reason so might be connected.

Hello! @my_niu thank you so much for your great content creation and your amazing blog of Myniu. I experienced the same problem with my NIU NGT, This not have hall sensor, directly have the throtle ring in the grip. I experience the issue constantly especially with a bad terrain riding. Also, I experienced other CRAZY problem, is about the Battery level, I have two batteries panasonic 35ah60v and sometimes after make a riding i discharge the battery around 90% both batteries and after little time one of the batteries go to 100% again, also, can ride some kilometers and the battery level still on 100% and other is discharging. I checked the voltage levels when one battery is at 100% and other at 80% the battery voltage it’s the same, but NIU app and screen shows different level, anyone experienced this problem? Thank you in advance!!

Worth a shot but had been getting this error literally non stop especially with holes in the road or speed bumps etc! Went under the seat and dusted everything till it was sparkling and so far it seems to have gone away feel like the dust may have been interrupting one of the contacts on the FOC

I just found your video, I have the same throttle problem on a (december 2018 built?) Niu M+, after driving 1,5 years and 2000 km it started randomly doing this that it sometimes drops from 48-50 km/h 5 or sometimes even 10 km/h for a short time. Chinesium quality I suppose.

Hello, could tou HELP me? I bought recently 1 Niu N1s from auction( without papers and batteries). Was a ridesharing scooter and it does not have a key, only a power button. I try to put a battery inside and try to start, but nothing happens. Can you tell me how to bypass that power button and directly start? Maybe connecting some wires inside will fix this.Nowhere i can find that information. Thank you!

Hi, i have a similar problem to my N1s, sometimes when i driving on full throttle it los a little bit of speed when the road is a little bit bumpy. Do you recognice that problem?

So to just (kind of) round-up this: I've installed a different FOC (aka controller) and ever since never experienced Error 140 again. Like others already assumed, I second the theory of flakey connections to or inside the original FOC - cold/broken solder-joints are also possible.

I got code 12 and 120 today.Really annoying i must hard reset the bike then it runs again normaly. Sympthoms are like the bike start to shake feels like u driving with a low pressure tyre or something block the wheel.Also no throttle respond.Terrible.If this error come back probably the controller need to be replaced.

Vous saviez comment faire pour démonter le tableau de bord du mqi+ pour changer le liquide de frein ?

Hi, I have just bought a niu M+. I do not know really how I managed to do it, but when I am turning the acceleration, it goes backwards. Did this occur to you?

Brilliant video and great comments below. But I found this video while searching for a solution for error code 99. Have you come across this error?

I also have or I had problem number 140. Several times it happened earlier that he did not want to move immediately, but now the problem got worse. For me, it was helpful to turn the steering wheel all the way to the right. Perhaps a slight vibration during this maneuver shifted some electrical contact. I turned on scooter 0 times / and this problem did not pop up

looks like no solution for error 140.

Have the same issue after 23000km and 4 year...

Niu bikes are flawed. I bought a second hand N GT and the 140 error attacks any time. This bike is so unreliable and dangerous that sales of these should be forbidden. That bloody sensor is unnecessary. Super Soco do not have and hence in London delivery services are using them. DO NOT BUY NIU, IT IS JUNK!!! Recall these bikes and fix them!

So? Did you find a solution?