Dear you should check all tyres break shoes and front shocks condition ............ check belts condition A/C, Genrator, water body betls if needed change them, Timing belt is also important, Timing pulley bearing is also important check it ................ Styring hard is ok no issue cause with time it will loose and make noise the bush in styring wear with time and need to change but ur is ok ................ Check central locking system by good electrician i also have problem some door opening and some are not it happen cause there are steel rods with electric motors in doors to open and close steel rods sometime misalign or not properly fixed it can easily be done ........................ sound from back side area mostly due to back seats lock wear tear dnt ever try to change its very hard if seats are loose and not fixed in its place ask good dentor to place rubber pieces on door hocks or apply neto tap simple ........... you need to check it all by very good mechanic and done these thing cause after more time it will be worst
