Fiat punto hgt p0335 rpm sensor

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I have this error for a while although I changed and put new crankshaft sensor... and still i have this error code

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could it be some other sensor or? something about crankshaft cable, connector etc?

i dont have problems with starting the car...

I have only randomly, occasionally rough idle and sometimes rpm drop and car dies, but immediately is starting again without any hesitation...

thats mind f*ck, i have this "problem" for a year and still cant manage to find out about the error...