Yeah you could just hit the button to activate the system. Replacing the corner sensor is def DIY'able. I think there are a total of 10 bolts between 10 and 8 mm. Use a plastic putty knife to unclip the bumper at the fenders, pull it out then lift the cover off the front. Don't pull out too far because the leads on the sensors isnt very much and if you have Cold Weather Package, the headlamp washer hose is also cut very short. It's a pressure fitting with a retaining clip. Remove the clip and pull the coupling apart. If your washer rez is full, be sure to have a container to catch the washer fluid so you can replace it later.

Pop the sensor out, put the new one back in and smack it all back in. Your first time doing it will take about 1.5 hours... When you need to do it again, 15 mins.

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2011 E70 50i M Sport