[terryjm1]

i just had the upstream NOX sensor fault code. It had 2 occurrences stored as well as a permanent code. I cleared the 2 I could (permanent code remained) and the check engine light went out. I drove it for 2 days and now the permanent code is gone.

This check engine light came on after driving 16 miles down a steep mountain grade behind someone driving obnoxiously slow, speeding up and then slowing down repeatedly. I used the exhaust brake as I always do on this trip but had to turn it on and off repeatedly due to the erratic slow driver in front of me.

Think this is any way related?

I purchased a new sensor and it is standing by… should the code return. How long do you think I should wait before I return it?

 

[renaissanceman]

i just had the upstream NOX sensor fault code. It had 2 occurrences stored as well as a permanent code. I cleared the 2 I could (permanent code remained) and the check engine light went out. I drove it for 2 days and now the permanent code is gone.

This check engine light came on after driving 16 miles down a steep mountain grade behind someone driving obnoxiously slow, speeding up and then slowing down repeatedly. I used the exhaust brake as I always do on this trip but had to turn it on and off repeatedly due to the erratic slow driver in front of me.

Think this is any way related?

I purchased a new sensor and it is standing by… should the code return. How long do you think I should wait before I return it?

Mine just did the same thing, but when the code threw, I lost the exhaust brake. Slightly unnerving. I'm trying to find a sensor that is actually in stock to replace it, I had someone on a facebook group suggest looking for wires that had worn through on the sensor harness.

 

[Scott]

I got my downstream Nox through Summit Racing. Best price also. Mine kept throwing the downstream and I lost my exhaust brake.

 

[terryjm1]

I now have the same code in “pending“ status. So, I swapped in the new one today. I will report back after I get some miles on it. I used one for a GMC Savanna 3500 which uses the same 2.8 engine. It is an OEM AC Delco and it was in stock, unlike the indicated part number for the Colorado/Canyon. I went this route because the aftermarket uses one part number for both the Colorado/Canyon and GMC Savannah. Obviously, they are different OEM part numbers. However, visually, the only difference I see is the Savannah has a longer wire bundle. This could be a mistake but so far it seems to be working fine. The data on my code scanner looks good. I did figure out my old sensor kept dropping to a zero reading sporadically. I do not believe that is normal. Again, I will report back after I get some miles on it.

 

[renaissanceman]

I now have the same code in “pending“ status. So, I swapped in the new one today. I will report back after I get some miles on it. I used one for a GMC Savanna 3500 which uses the same 2.8 engine. It is an OEM AC Delco and it was in stock, unlike the indicated part number for the Colorado/Canyon. I went this route because the aftermarket uses one part number for both the Colorado/Canyon and GMC Savannah. Obviously, they are different OEM part numbers. However, visually, the only difference I see is the Savannah has a longer wire bundle. This could be a mistake but so far it seems to be working fine. The data on my code scanner looks good. I did figure out my old sensor kept dropping to a zero reading sporadically. I do not believe that is normal. Again, I will report back after I get some miles on it.

What is the part number for that sensor? I just bought a Herko aftermarket unit out of desperation.

 

[terryjm1]

What is the part number for that sensor? I just bought a Herko aftermarket unit out of desperation.

ACDELCO 24001919

Herko is the supplier that shows the same part number for both models.

 

[terryjm1]

I will add, Herko claims to sell OEM sensors… I suppose they can buy them from the same German supplier GM does.

 

[SFLTruck]

The new number is now 24001920. I ordered an upper and a lower from "gmpartsonline" to store in my RV. I really don't want to be out and about and have one of these take a crap and be stuck somewhere far from home. Worst case having to go to a dealer somewhere and being told it's a NOX and it will take XX days to get it. I can at least provide it and get the repair done. Most likely I will fix it myself do to lack of trust anymore. I have a box in the trailer with those two in it and a pressure differential sensor.

 

[terryjm1]

i drove the truck about 100 miles and scanned for pending codes again and the code is gone. So, I guess the Savanna 3500 sensor works just the same.

 

[SFLTruck]

i drove the truck about 100 miles and scanned for pending codes again and the code is gone. So, I guess the Savanna 3500 sensor works just the same.

Nice , Glad to hear it!