Yes, crankshaft sensor is relatively cheap to buy and easy to replace. I would recommend buying the sensor from a Vauxhall dealer spares dept., ebay specials are, in my experience, cheap for a reason.....
Make sure the old o-ring comes out with the old sensor.
For specific info either buy the Haynes manual for your car or join an owners forum such as-
www.vauxhallownersnetwork.co.uk
Free to join, tons of good info.
fred
January 2011