I PURCHASED A NEW 2002 TOYOTA HIGHLANDER FROM SIERRA TOYOTA OF LANCASTER, CA. I HAVE EXPERIENCED NO PROBLEMS WITH THIS VEHICLE UNTIL 25 JAN. 2011 WHEN THE ENGINE OVERHEATED WHILE DRIVING 40MPH ON CITY STREET. I TOOK MY VEHICLE TO MY MECHANIC AND HE INFORMED ME OF A PROBLEM WITH THE 2.4L 4CYL TOYOTA ENGINES IN WHICH SOME OF THE HEAD BOLTS BECOME LOOSE/STRIPPED WHERE THEY ATTACH AT THE ENGINE BLOCK. I CALLED SIERRA TOYOTA OF LANCASTER AND THEY DENIED ANY KNOWLEDGE OF THIS PROBLEM. ON FURTHER INVESTIGATION, I DISCOVERED THAT SIERRA TOYOTA HAD A SPECIALIST SERVICING ONE OF THEIR VEHICLES BY PLACING INSERTS INTO THE STRIPPED HOLES THE VERY NEXT DAY. SIERRA TOYOTA REFUSED TO GIVE ME ANY MONETARY ASSISTANCE IN REPAIRING MY VEHICLE. AFTER RESEARCHING THE BOLT PROBLEM ON THE INTERNET, I HAVE FOUND NUMEROUS TOYOTA OWNERS WITH THE SAME ENGINE, THAT HAVE HAD THE EXACT SAME PROBLEM WITH THEIR VEHICLES. THE ONLY FIX IS EITHER A COMPLETE ENGINE REPLACEMENT OR HAVING AN EXPENSIVE ANCHOR-BOLT REDO. MY COSTS LOOK LIKE TO BE ABOUT $2500, IF THERE IS NO OTHER DAMAGE FOUND DUE TO THE OVER-HEATING. AT THIS POINT, I DON'T EVEN KNOW IF THE NEW ANCHOR-BOLT SYSTEM WILL WORK. MY VEHICLE WAS ALWAYS WELL-MAINTAINED AND CURRENTLY HAS APX. 126,000 MILES ON IT. *TR