so today i did an oil change and i started the engine an it sounded bad then i remembered i forgot the oil! old timers i guess what a dummy anyway i shut it down add the oil and now the poo17 so what caused that? timing chain slap the crank sensor? i can clear it then it comes back the car runs it goes down the road doesn't seem to be any issues but it needs to get fixed. i can do that by changing the sensor i'm guessing but i would like to know if running it for a minute without oil and the noises it started to make caused that or maybe the sensor just failed? any ideas?