Carrera vengeance cadence sensor repair

[Simondempsey]

Hi
I own a Carrera vengeance espec !
The pas cadence sensor has broke, I’ve took it to Halfords but they refused to give me an exchange or refund because they had been used !
Because of the pandemic we’re in atm
Halfords are unable to order a new sensor in which has left me stuck to get to work and as a key worker my bike is vital,
Can any help on what the right sensor I need to get and how hard would it be to fix ??
Thanks
Kind regards

 

[Nealh]

Pictures and type of sensor, if it is a torque/optical sensor then you are stuck. They are Suntour oem parts only.
The optical one I believe VFr/d8veh said needs cleaning as grime can affect the operation.