On my 2006 S40 2.4i, intermittently get a engine maintenance light.Seems to only come on in warmer weather. Sometimes it make the cruise control not function. Dealer said it was the brake position sensor so I replaced it. That did not fix the light. It is not a huge deal, it just makes car emissions a bit annoying to do. I read here that it is probably my booster, I was just hoping to run it by you kind people.