07 Honda Fit - P2413 code after alternator swap, is it possible the mechanic did something?

I just replaced my alternator with a mechanic a friend of mine recommended. When I went to pick up the car, I noticed a 'ticking' when the car fired up that wasn't there before. I'm not a confrontational guy so I didn't accuse him of messing anything up. I drove it home about 10 miles, no issues. I drive it the next day and the check engine light comes on. I get the code and it's P2413 which has to do with the EGR valve, is it possible the mechanic messed something up when swapping the alternator? I really don't have the money to make ANOTHER repair right now, am I ok to drive with it? What am I risking by driving?

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