Mercedes clk 320 2000 automatic starting issue please help!
 

My 2000 clk 320 merc started when and as it wanted to now it won't start at all phoned rac and they said it was my crank shaft position sensor so I changed it with an original merc part and it still won't start. I've also checked all fuses as I did have a problem with starter relay fuse keep blowing when I pressed the engine start button that has now bin fixed. Also I have checked fuel pump and pressure and all that is working fine with no issues. Please help me what else could any1 advise me to check and do with this car.
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