My check engine light came on yesterday. (Don't ya just love it when that happens?:confused5 I had my local auto store read the code and the nice young man told me it translated to 'the exhaust CAM shaft over-retarded'. What in the heck is this? Is it serious enough that I should get it fixed? DIY? How can I turn off the check engine light if it's an ignorable problem? Thanks! I'm trying to be a DIY for my 2011 non-turbo R56 Cooper. Update - I am getting 2 codes: P0302 'cylinder 2 misfire' ( I changed all spark plugs recently and thinking I need to take out the second one from the left (pass side) look at it and maybe reseat it) Agree? Other code is P0015 - 'exhaust cam position over retarded bank 1' Is this something I need to have professionally checked out? Last service I had they found that the drive belt has minor cracks. Don't think these are related. Advice....please?