CEL after starter replacement

What is your question?

I just brought my car back from getting the crankshaft sensor (and starter) replaced. As soon as I started the car, the engine light was on. The mechanic scanned the code, and said it was the intake manifold code and cleared it. By the time I started it up again, it turned back on. This was not on before the service (only the crankshaft sensor code). I was wondering if this is actually broken, or if it happened at the mechanics (like putting things back incorrectly).