Camshaft sensors in most cars are really easy to change, though as with all things under the bonnet we'd always recommend that you bring your car to an expert unless you know what you are doing.

In most cases this work would take 10-15 minutes.

Without the car in front of me, or a workshop manual, I would hesitate to give you more precise instructions, but usually the sensor is held on by just one or two bolts and an electrical connector.

Assuming that is the case, remove the bolts and connector and reverse the procedure for the replacement sensor. Be careful that you do not damage the new sensor.

You should be aware that some cars may need their on-board computer (the Engine Control Unit - or ECU) reset following this operation. Ideally this would be done by a main dealer or garage with the correct equipment.