Engwe ep 2 pro orange electric bike + 1 battery

Bike was working perfectly fine before leaving it at mechanic to check over and fit new brake pads. Now it has error 24. I have gotten my money back from him, so i just want to sell it as is. No longer interested in this. Brand new battery arrived as well ( paid €370 ) which i can sell for €100. 2 brand new keys with it. Never charged or used. Original battery in bike is working perfectly fine too. At the time i just wanted more range for work, going and coming back for work. Bike turn on, all lights, brake and brake lights working fine. When you pull the throttle, wheel spins a tiny bit and then says error 24. Google says it needs new sensor. Good bike who can work on these.