2007 XUV 620I . is apparently in fale safe mode rear coil and rear fuel injector or disabled by ecu,checked all sensors related to ecu and found that one of the throttle position sensor failed the ohms test,if this sensor is bad will it signal the ecu to go into the fale safe mode. John deere says the t.ps. can not be replaced you have to replace the throttle body assymbly. Over $800.00 anybody have any similar problems?