Hello, I don`t really remember how we solved this problem, but I can give you some advice: charge the battery well, disconnect the terminal for about 30 minutes (this sometimes helps to reset errors), check the sensor on the air filter, move the cube, use a contact cleaner, I bought something like this and is useful for cleaning and maintenance), there is another cube with cables located in the upper part of the engine, in the middle, closer to the turbine.