My car, Infiniti I30 2001 gave me problem starting 1st and then it did not turn on at all.
I got the following error P0335 crankshaft position sensor "A" circuit

It comes out there are 2 crankshaft sensors. one by radiator (front?)
and one on the side.

would I know based on my error code which one I need?
P0335 crankshaft position sensor "A" circuit
I spoke to my mechanic but he wasn't sure which and recommended changing both.

is the front sensor the one that has 2 screw holes?
I know based on pics online that one has 1 screw hole and the other has 2 screw holes, not sure which is which.

also my mechanic said probably I need the POS sensor changed by the radiator as supposed to REF. his manual didn't say front or side.

anyway would appreciate your help..

any idea where is the cheapest place to get these?

 

try courtesy nissan @ http://www.courtesyparts.com/
or http://www.rockauto.com/

 

do I need to change both crankshaft sensors?

so it comes out that POS is the one with one whole and more expensive. I think that is one I need changed.