This problem started when temp dropped below 0 degrees celsius . My Mercedes-Benz 2001 A160 would not start. Radio works lights work the air conditioning works so i do not think it's a battery problem. i would rotate the key to the last position and it would not start jut make a humming noise . I wait for 2-3 minutes and it would start and run just fine . And it will start every time after i first start it . now it is getting warmer and the problem is not that frequent . i am afraid that one day i will not start altogether. :-S ... anny suggestions on what the problem might be ?