I'm willing to bet money your coils are shot. You'll need to replace all 4. Even if all four aren't broken, It's a good idea.
The 4 misfire codes are directly attributed to the coils. The lean condition comes as a result of incomplete combustion aka misfire. The overboost condition is most likely a result of the computer trying to make sense of what is going on with your car.
I would change the coils. Clear the codes. Then drive it for awhile. See if the check engine light comes back on again. If the overboost condition comes back I would start looking at the Turbo Boost Pressure Sensor. Other than that, coils run for about $45 - $60 / ea. It is highly suggested you replace all four to ensure you have an even burn across all four cylinders.
Hope I helped.