I have high NOX from my emissions test on my 940 91 Turbo (not Mercedes; Volov, but the principle is the same) even though I recently replaced the CAT. I called the CAT OEM and they said "Check the O2 sensor"

I had recently replaced my O2 sensor with a Bosch Ford Mustang 92 GT O2 sensor, which everyone on the Volvo Forum says you can do, but the OEM says you can not.
So I scoped it. I found an example waveform for a Volvo 940 Turbo below on the Internet.

My scope output was pretty much the same, so I am confused as to whether the O2 sensor is at fault.

Got any ideas?