Another check engine light problem.....

Hi, new to the site. Been having some problems with my ’03 Spec V.
While driving the arrow on my tach dropped to 0 RPM, the car was still running, then it jumped up to the correct RPM’s, then the check engine light went off.
Mechanic checked it, came up with code P0335 (Crankshaft Position Sensor A Circuit Malfunction). Had the sensor changed and it’s still setting off the light with the same error code and dropping the tach arrow.

Just wondering if any one has had the same problem and found any solutions.

I heard that there are some problems with the software in the car, true? Is there really a software upgrade?

Thanks

There is a RECALL on the crank pos sensor. Have dealer change for free.