i have the same problem with my ignition slot/button - hi speed vibration that gives a buzz, however it is intermittent. Chris.F had the same and his dealer adjusted it -- some days later, his car's electricals went beserk as his post explains. I think the dealer must have made a tweak that made the electrical contact faulty (Chris mentioned in his post the button was far stiffer).
Best make sure the dealer know's what they are doing otherwise there is a risk of bigger problems. |