VW Trouble code P0391

The check engine light on my 96 VW Jetta GL is been on for some weeks now.
When I checked with the computer, the code P0391 Camshaft Position Sensor B Circuit Range/Performance (Bank 2) came up.

Has anyone had a similar problem? Is it the sensor faulty itself and needs to be replaced? May something else be the culprit?

Na it's the sensor. Change it and the light will go away.
Franco