I bought both OE Nox sensors for my 2014 6.7 , the cost with labor was $2000 , the labor was only $300 . This was not at a dealer , but a local diesel repair shop I’ve used with great service . Would have done them myself after purchase , but thougt I’d check with the shop, and for $300 I wasn’t about to do it myself. The sensors are a bit spendy , don’t remember which one you can buy a reman , the other was only available new . Anyway that was going on two years ago .