Bought 07 mazda 6s 3.0 online auction for $1600 from RoadOne. Big mistake.I wasnt allowed to see the car untill I paid for it. The car needed a jump hard to start . The car started drove it home the car died in my driveway..I tried starting heard valve noise, engine locked up.Removed spark plus valve covers the LH timing chain jumped. The RH cams looked dry. compared to the LH. Remove LH head 4 valves were broken. Im not sure what caused complete engine failure. I need to rebuild engine or find a used one if the price is good! Has anyone expericenced this engine failure? IMy scanner had PCM lost communcation with bus Hi and Lo, Multiple loss of communication.