Nox Sensors - Engine Light

[2018EcoDieselOwner]

Hi. Had the engine light come on, on my 2018 RAM EcoDiesel. The dealership did a regen and then had me drive it on the highway, which I did for over an hour. This was done last night and the truck has not been driven yet and probably won't be until the weekend, it's now Tuesday Sept. 9/24. I was told that if the Engine light comes back on then the NOX sensors would need to be replaced as a next step, perhaps as they were reading incorrectly during regen, per the mechanic's notes on the order. My question is, do I have to replace the NOX sensors right away as it is not cheap, is there harm in not doing so, if I have had no other problems with the truck? Thanks.

 

[Truckster66!]

Hi. Had the engine light come on, on my 2018 RAM EcoDiesel. The dealership did a regen and then had me drive it on the highway, which I did for over an hour. This was done last night and the truck has not been driven yet and probably won't be until the weekend, it's now Tuesday Sept. 9/24. I was told that if the Engine light comes back on then the NOX sensors would need to be replaced as a next step, perhaps as they were reading incorrectly during regen, per the mechanic's notes on the order. My question is, do I have to replace the NOX sensors right away as it is not cheap, is there harm in not doing so, if I have had no other problems with the truck? Thanks.

I just went through the same thing with my 2018. They first said it was bad DEF fluid, charged $500.00. Three weeks later check engine light came on again.
This time said I need new Cat and both new sensors….$3,700.00.
After my own searching discovered 8 year warranty or 130,000 km warranty on cat…..the dealership claimed not to know about that????
I requested they only change the Cat not the Nox sensors……which they were going to charge $2,700.00 for….they said they would likely break when replacing the Cat…..I told them I wanted the sensors back if they changed them.
After the Cat was changed, surprise , surprise……Nox sensors were fine.
It’s been a month since and all is good!
I drive in the city mostly which causes issues for the regen….have been using Rislone Def and Scr emissions cleaner additive as advised by a friend who is a mechanic to assist in regen issues.
The dealership also killed my battery while it was there…..wanted to replace my battery, then also said I needed a new alternator…..changed battery, not alternator after friend rechecked it and it was fine…..always ask questions….saved me $$$$$

 

[2018EcoDieselOwner]

Based on your experience and I'm sure others more like you, who can anybody trust when our vehicle needs to be fixed? It's pretty pathetic that a dealership cannot be trusted. Thanks for your story.