Codes P0335 and P1320

This is not a US market car, but from what I can find, it is the same as the 2000 Nissan Sentra in the US. Which engine does your car have? It will be important information here if we need to look up diagrams or anything.

As far as what the codes mean, they both are pointing to problems with the crankshaft position sensor or its circuit. I am attaching ProDemand's information concerning the P0335 code in the images below. The P1320 code specifically says to solve the P0335 code first, so we will deal with that later if needed. Also, I understand that you do not necessarily have all of tools needed, so do what you can for now.

First thing though, go get the battery tested and make sure that the terminal connections are really clean and really tight on both ends of each cable. You would be surprised at how often this solves people's problems.