I see now that you are in Ontario too-- I'm in Aurora. I just went through the conditional pass on my wife's car (a Toyota, not a Volvo). It's a bit of a racket-- cost me $212 to get a pass on a car with a bad cat-- started with an e-test that I knew it would fail (a persistent P0420 and a rear 02 sensor with wide range swings), then $145 for diagnostics (mostly the old dyno e-test and a few follow up measurements at Canadian Tire), then a retest. No improvement in emissions, but the bad cat would have put it over the $450 you need to spend to get the conditional pass. No improvement for the environment, just a cash grab.

I think your best bet is still waiting for codes to see if they point to the reason for the rich running, fix them and go for a retest when the monitors are ready. Failing that, I would get the diagnostics done somewhere reputable, then have the fixes done somewhere affordable-- you can take your time after you get your stickers.

Good luck!