DH's light is on! The exceleration is Aweful! So we are going ot have it checked after the Chaos of the president's funeral is over. (not meant in a bad way...they are just telling everyone here not to drive for the next few days!)
Mine was on, I took it to the dealer. THey said it was telling them I had a problem in the automatic transmission. I have a manual trans. They downloaded some updates for the computer chip. It's all better now. And it was free, I have such low miles, a lot of stuff is still under warranty.