I have a 2006 VW Beetle TDI. While driving almost 50 the car felt like it suddenly went into neutral..the PRND lights started flashing on the dash. I pulled over and turned the car off..restarted and everything was fine. Drove the car home which was only a few miles, the yellow check engine light came on before getting home. Had the car scanned for codes and it came back with P0717 Input/Turbine speed sensor “A” circuit no signal. Didn’t want to take a chance driving again so trailered it to the mechanic. Should this be a simple fix or should I prepare myself for a really big..expensive issue?