Aha, it's becoming clearer!
I can see the two manifolds will cost me DEARLY. Together they are about $1100 at oefordparts.com However if I can get them separately (i.e. replace only the failed one) it should work fine, and give significant savings...
My normal service advisor wasn't there so I suspect this guy is messing with me. I'll go back soon and ask the guy I know to pull the codes for me and clear the existing CEL.
I already DECLINED the work for now. Worse comes to worse, I know a couple shops that should put them in for me... if I order the parts separately. I can speak passable Spanish so I can get things done at shops that are so cheap...

Thanks for the advise, folks... This car isn't even PAID FOR yet... so putting 3 grands' worth of repairs is simply OUT OF QUESTION for me. One grand, I may be able to afford...