Hi I have a 1991 honda civic sedan. and yesterday I had the oil changed, I had the fuel system cleaned and the tranny oil replaced.
Now my check engine light is coming on. what should I start to look at. and what does it mean when that light comes on.

 

It's related to your emmisions control system.

Probably the EGR or O2 sensor (more likely). Go to Advanced Auto Parts and they will scan it for free.

 

or check what code the ecu is throwing

 

sweet thanks

 

i think, im not positive tho, that would be the
O2 sensor