engine overheated and now check engine light is on

Hi,

The radiator recently cracked on my 98 civic as a result of which the
engine was overheating -- the engine temperature gauge was past the
red line, which i onyl noticed once steam started comming out of the
head.

I took it to the mechanic, and he replaced the radiator and said there
didn't appear to be a problem with the engine as a result of it over
heating.

so i drove the car for a day, and then all of a sudden the check
engine light came on (the temperature of the engine with the new
radiator is fine though according to the gauge ).

Anyone have an idea what could be wrong with the engine?

Is it safe to drive?

I'll get the car fixed, but since i'm handing it down to my brother
after i get a new car in four-five months, i don't want any expensive
repairs. Might there be a cheaper repair to whatever the mechanic is
likely to suggest?

Thanks.

 

sorry that should have been "steam comming out of the hood".

 

if there's a check engine light, there will also be a code. get that
read, then report back. thanks.