The 940 failed emissions today. Here's the results.

HC:
Limit: .59 gpm
Tested: .80 gpm

CO:
Limit: 15.00 gpm
Tested: 8.05 gpm

NOx:
Limit: 2.00 gpm
Tested: 3.66 gpm

So it seem the NOx was through the roof and the HC's barely squeaked by. My old '91 740 nonturbo had failed once with NOx too high (but not nearly this high), but a good beating to get the cat nice and hot did the trick. I ran the test twice (I work at the shop that the inspection was done at) and ran the car hard before I started the test. No dice. Tomorrow I'm replacing the 02 sensor, since the HC's look a bit high to me, and my mileage isnt what I think it should be (19mpg, with a lot of highway driving) and see if that helps. Any other ideas? It also dosent help that this is a non-egr equipped car.
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'91 Volvo 740 wagon. A big comfy box.... and a '90 Mazda 626 GT turbo, 16psi on upgraded turbo and a bunch of other mods.