Does an EGR valve help to reduce CO emissions ?

My car failed smog test due to CO gases being slightly above acceptable limit. Could this be corrected by replacing the EGR valve?

There are no noted driveability problems. Car has just over 58,000 miles on engine. Last tuneup was done approximately 23,000 miles ago (recommended 60,000 mile intervals).

TNX.

The EGR valve reduces NOx. (Oxides of nitrogen)

Thank you for your quick and concise reply.

My original post included two questions. Unless I am misinterpreting, your answer to both questions is "No".

sometimes(namely in saturns) a good cleaning is all you need

I have been doing some reading of articles about NOx, EGR valves, Oxygen sensors, and
catalytic converters, in an attempt to discover if an EGR replacement is logical for
correcting an excessive CO emission. So far, from what I have read, there is no indication
or evidence that an excessive CO could be corrected by replacing an EGR valve.

However, my recent experience at a dealership's repair shop lead to replacement of
the (reported) bad EGR valve. This story does not end here, but I am attempting to
prove that excessive CO is not caused by a faulty EGR valve. From what I have read,
excessive NOx gases, not CO gases, can be caused by a faulty EGR valve. The NOx
and the HC gases were found not to be excessive.


What do you experts think? Does an EGR valve function to reduce CO gas emissions?

Regards,
de ~Vince~