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It sounds to me like you should get another mechanic to take a look at it if he's done all that and still can't find the problem. That code relates to all the things you've replaced.
This is for Push Button Start E60 models only Put the key in ignition. Leave the car in gear and push the "Push to Start Button" but only press it 1 time. Don't worry, car will not start. This is called position 15. All dash lights will light. Now push and hold the Odometer reset button. It will initially light up a warning triangle, continue to hold until the Oil can symbol lights up. The oil lamp should be the first to illuminate. For the oil reset, when the oil can illuminates, let go, then press and hold. After about 3 seconds a message saying "Reset?" will appear. When it does, let go of the button and press it again until the mileage indicator resets itself. That should do the trick, if for some reason you try this and doesn't work then I recommend taking it into a certified BMW shop/dealer and have them reset it for you. They shouldn't charge for a simple reset.
I'd check the spark plus and engine belt out around 60k. Might also want to consider coolant/trans flush. Sounds like you are already on top of things with the oil/filters.
This could mean a couple of things related to emissions. The catalytic converter could be shot, it's possible the oxygen sensor went out, or you could have an exhaust leak. I'd recommend taking it to an emissions specialist and get it diagnosed to find out exactly what the problem is. Check out the directory to find a local shop www.repairpal.com/directory and search for your zip code. Under each shop location it'll list whether those shops specialize in emissions or not.
Check the stop light switch as it may have gone out. It's located on the upper back side of the brake pedal and if that's the problem it's about $12 at the parts store.
The mechanic has to measure the rotor to determine if it has enough material to resurface, and if it doesn't then rotor replacement is required.
The best bet would be to take in your car to a certified tech who can scan the computer for the proper codes. The problem is there are a number of things that could cause the light to come on, but the scan tool will tell you exactly what tripped the light. Your car is only 4 years old, it may still be covered under warranty.
I've seen this happen and when it does there could be a number of things, but it's likely you need a dealer to install a DRL Jumper Kit...the bulb is not making contact with the socket correctly. I believe last time I heard about this there was a recall, you should check our common problems/recall for the 2007 Ion and see if it's listed.
It will typically cost you 2-400 bucks for just one wheel bearing, but if you are looking to fix both wheel bearings it'll be anywhere in the range of $500-$800 depending on whether it's the front or back. www.repairpal.com/estimator for more details.
I had the same thing happen to me. My windows seem to come and go, sometimes they work sometimes they don't. Last time I had it brought in to check they said I needed a new door window regulator and said it would be $200-$300. Most of that was in labor as they have to take apart the door. Your best option is to go to www.repairpal.com/directory and input your zipcode. Click on a couple of the shops and under the Amenities section it will list whether they provide free estimates.