1997 Saab 900S fault code P0705 shift-lock relay faulty. Does this require a new gear selector position sensor? What is this part, where does it go and is this the same as a neutral safety switch?

How to repair the shifter so it will go into gear and if it wont go in reverse i cant get the key out

I assume you have an automatic transmission.

If so, this is the relay that does not allow you to shift from park into drive unless your foot is on the break. The actual solenoid is located under the shifter counsel. The relay itslef is in the fuse box and will be labeled as such.

since it's a bi-metal relay, try tapping on it a few times with the handle of a screwdriver.

To replace is simple and relatively cheap.

If the solenoid is bad (i.e. the relay still works) you will want to bring it to a saab specialist as this is tied into the anti-theft and you could end up disabling the car due to theft deterent system. it would then require a tech with a saab-specific computer to reset everything for you.