My LocalScript doesn't working

[Berat_HighMode (lilend)]

script.Parent.Event.OnClientEvent:Connect(function(plr)
	local player = plr
	local mouse = player:GetMouse() 

	mouse.KeyDown:connect(function(key) 
		if key:lower() == "e" or key:upper() == "E" then
				script.Parent.EngineEvent:FireServer()
		end 
	end) 
	
	mouse.KeyDown:connect(function(key) 
		if key:lower() == "w" or key:upper() == "W" then
			script.Parent.SpeedUp:FireServer()
		end 
	end)
end)

[SelDraken]

A local script will not work here, you need to put a normal ‘Script’ instance, and set its RunContext to ‘Client’

[CelestialHonour (Celestial)]

Alright, so heres some things wrapped up, LocalScripts only work when parented to PlayerGui, StarterPlayerScripts, StarterCharacterScripts, etc… I see what you are trying to do, heres a way, you can insert a ObjectValue and parent it to the player, name it “VehicleObject”.

Use the server script to set the value of VehicleObject to the VehicleSeat Instance.
and then you can insert a localscript into starterplayerscripts, and past this (its your own script, but fixed):

local player = game.Players.LocalPlayer
local canStart = false

local UIS = game:GetService("UserInputService")
local vehicleSeat = player:FindFirstChild("VehicleObject")


UIS.InputEnded:Connect(function(input,gp)
	if gp then return end
	
	if input.KeyCode == Enum.KeyCode.E then
		if vehicleSeat.Value ~= nil and canStart then
			vehicleSeat.EngineEvent:FireServer()
		end
	elseif input.KeyCode == Enum.KeyCode.W then
		if vehicleSeat.Value ~= nil and canStart then
			vehicleSeat.SpeedUp:FireServer()
		end
	end
	
end)

script.Parent.Event.OnClientEvent:Connect(function(plr)
	canStart = true
end)

again, this still has multiple issues, so I recommend you to finish learning about how local, server scripts work and all that, then proceed.

[mhmdsndb3 (Printer)]

Isnt it
“Doesn’t work”?
(Just so none make fun of you in the future for bad grammar)