the other day my 09 smart failed to start. it cranked, actually cranked after i touched the key just once, but wouldnt "catch". i tried this three or four times. i opened the engine compartment and checked the oil, it was low. i had half a quart from last oil change, and dumped it in. after another try, it started and ran fine. my question is, on our cars, is there a sensor that that will stop the car starting if oil is too low?? 09 smart passion w/47,000 miles....... thnx for any help.....