I drive a 2003 1L Corsa and a few months ago it started to leak oil. I followed the small pool of oil up and it was the Oil Pressure Switch. I looked on ebay and bought one for about £6 then replaced it myself. The leak stopped, but just a few days ago it has started again. Does anyone know how this is happening again so soon and would I be able repair it again by replacing the switch again? There is also a small connector that attaches to the switch and clicks into place. Could this also be the proble, or could that be the actual problem and not the switch?