I've changed my sump and put new oil pick up pipe on 3-4 wks ago, ive had the warning light come on a few times just as ive pulled into my road recently, i have checked levels and they are fine. is it likely to be a dodgey sender or is my oil pump going to want changing? i dont have access to VAG.com, and last night on my way back from a mates house the light came on 6-7 times i noticed it seemed to happen at low rpm. any suggestions would be appreciated ?