Thanks for the replies on the check tpms message on the liberty ovehead comp.,firstly,start deflating one tire at the time till yoiu find the right wheel,as tire deflate to below 25lb pressure, low tire pressure message will appear on the over head console,when deflating the tire with faulty sensor the message on the overhead console wont change it'll keep on saying check tpms system then you know you got the right wheel with the faulty sensor,secondly,sensor from dealer $120 dollar+$60 to put it in+ tax=$200,Nappa,sensor $44dollars+$15 dollars to be put in by your frienly tire shop total+tax=$67+pays to shop around,hope this tid bit will come in handy for somebody,by the way,it was the back left wheel.Thank you to all who reply.