I purchased and installed an factory replacement K&N Air filter in my Land Rover and the Check Engine Now Light came on! I feel like the Mass Air Sensor has been killed.....and need so information on how to approach cleaning it or replacing it in order to get the light to come off. Has anyone else tried this filter with the same results??? I took it out and will replace it with a new Land Rover Filter from now on. Also I would like to know what kind of OBDII Code reader I need to trouble shoot the Light in the future? Thanks