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?

You're not going to hurt anything, but you'll fail any emissions inspection. You can ask him to take a look at the EGR connections without being confrontational or "accusing" him. It's always possible to pull something off when you're working in the engine bay. EGR codes are common at ten years.

When he did the alternator he pulled something off and didn't realize it. Probably the tube that goes to the EGR passage cover right at the front of the intake manifold. If you look down in front of the engine you'll see a small tube sticking out that's supposed to have an exhaust hose attached to it, the noise you hear is the exhaust popping out the hose that is likely hanging free from that tube.

P2413 is the Exhaust Gas Recirculator.

It's possible something was knocked loose, or not reconnected during the alternator swap,

Take it back and ask nice if he can double check for that. If it's something minor like a loose wire, that he accidentally caused, it should also be simple to fix. If it's more serious than that, like the valve itself has failed, then it's probably just co-incidence.