Replacing the NOX sensors

On a Volvo does the computer have to be made aware that sensors were replaced? On my 2017 579 I had to replace NOx sensors and I did it at Peterbilt because they had to tell the ecm that the sensors were new. And it was $600 or so for each sensor back in 2021. But I replaced them once and never had to do it again.

 

Aftermarket NOX sensors?? Are they worth it, or should I buy OEM? | TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board
See posts 3,6,13,17.

Either truck or car a good rule is to use OEM for anything emission related. Ask any shop. Sure some person (not s ahop) will say I used this or that and saved but how long did it last. A tow would wipe out and savings and then some real quick.

Volvo SPN 3226 FMI 12 (Bad NOx Sensor) | TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board

 

That code, SPN 3226 FMI 12, is your outlet NOx sensor acting up. You could try cleaning it with carb cleaner, and sometimes it clears the check engine light for a little while, but most of the time it just comes back. These sensors are sensitive, and cleaning rarely fixes the real issue.

Since you’re swapping them yourself, you’re already saving a lot on labor. For aftermarket options, truckers usually go with Delphi, Skyline, Dinex, or Grizzly Air. They’re reliable, last well, and cost a lot less than OEM: often $250 to $400 per sensor instead of $800.

Replacing both with a quality aftermarket sensor is the way to go.

 

Probably the worst name in parts. Most shops won't touch Dorman if they have a choice. But they have to sometimes because they are available right away versus waiting a few days for OEM.

 

You want to start soaking them with PB blaster or something now.
Ask about the core,most are ok with cutting the harness right at the sensor. If so,then get the deepest 22mm socket you can find.
It wouldn’t hurt to pick up a thread chaser,should be the same as an automotive O2 sensor.