[FailerZ]

You have forgot one closing bracket

Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys) 
{ 
    new playerState = GetPlayerState(PLAYER_STATE_DRIVER); // Get the killer's state 
    if(PRESSED(KEY_LOOK_BEHIND)) //<<< Here
    { 
        if(playerState == PLAYER_STATE_DRIVER) 
        { 
            RepairVehicle(Infernus[0]); 
        } 
    } 
    return 1; 
}