Help my smart not Starting

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Can someone give me some advice my Smart Fortwo cabrio 451 700cc 3 lines on the dash everything works It should but not turning any ideias ?? 


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I suspect your Smart is 450 not 451 since you state it is 700cc.  

I also suspect you have a faulty shift drum angle rotation sensor. This sensor sits on left side of transmission. They fail due to corrosion on seal area between sensor and transmission allow water ingress into sensor. 

Cure:  Remove sensor, clean seal area and fit new sensor applying liberal amount of grease on seal area to prevent further corrosion and water ingress. 

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