HELP..... 1ST mercedes 2nd day wont start (turns over)

Question by flyingspanner2019 posted 10 months ago in 2001-2007 (W203)

hi, this is my 1st post 1st Mercedes bought the car EML light on drove fine wasn't in limp mode drove it home, the next day started a couple times sounded like the battery was going flat as it had previously been stood up for a few months. plugged my diagnostic machine in to see what faults were stored it came up with a air flow meter fault & crankshaft sensor fault … so as I do usually make a note of them clear the faults and start the engine and see if it comes straight back on and if not test drive for a few miles just to double check. well it wouldn't start !!!! was cranking over ok tho … locked it unlocked it tried again dash lights up as it should turn the key to start it still WONT START!!!!  BUT CRANKS OVER and mercs can be funny about voltages and battery power so I fit a new battery still the same so was thinking immobiliser ???! my mates a car locksmith tested the key fine now im thinking maybe as I erased the faults it wont start  ??? unlikely the AFM cranksensor ????? HELP …