Before few days i bought a 2010 model prius, which was in amazing condition, but when i started driving, i was keep seeing a message on dashboard display( unsufficient engine oil preasure) with yellow master light. I got confuse that why this is displaying again n again, i check my engine oil it was low, very next day i change my oil nd also oil filter, then again i saw the same message, then i check my car to mechanic ,he scanned the car and changed my oil presure sending unit sensor, again the problem still reamain then finall he suggested me to service my oil pump jali, but after that the result was same and finally he told me to change my oil pump, 2days had wasted but the problem was unsolved, very next day i changed my oil pump but unfortunately the problem was unsolved, me, my mechanic, and other two mechanics were saying, ur car engine has completed their age and i was dishearted, that the hell is this, but one of my friend was on the same point from the first day that this is not a mechanical fault, this is electronic fault, then last time i decided to go at the same electrician, and final after 4 days we got the point that every thngs fine, their pump, sensor, engine, oil every thngs good but my dashboard display is faulty, oh man then after 4 days i was feeling so happy, and quote has become true " khoda pahar nikla chuhaa" now mashAllah every thing has solved and my car is running good. I mentioned this whole just to help everybody that some times we assume that the fault is too big.