Can a bad NOx sensor damage the engine?
The short answer is, yes. Once the function of a knock sensor is shifted, you will begin to experience the drawbacks of a poor knock sensor, like reduced engine performance and low fuel mileage.
How do you know if a NOx sensor is bad?
NOx Sensor Problems Most times, this will be immediately obvious due to the illumination of your ‘Engine Warning’ light in the dashboard cluster, along with symptoms such as unstable idle, juddering/jerking while driving, and excessive fuel consumption.
What to do about bad def quality and NoX sensor?
There is a diagnostic procedure to follow to identify the problem. An intermittent problem like yours is the toughest to pinpoint. The exact fault code (SPN and FMI) will help, also any thing else you can tell us. Is there anything pattern or conditions that may be associated with it?
Why was my NoX sensor replaced by Freightliner?
Im new to the forum and seeking advice from some pros. 3 months ago had Nox sensor replaced by freightliner who said my One box filters were due a cleaning, Had DPFs baked overnight and DOC filter blown out. Truck (DD13) has been running great since. However, last week Engine light came on with the SPN 3216 FM 18 code (Inlet Nox sensor)
Do you have a NOx conversion efficiency fault?
It looks to me like you do not have a NOx sensor fault at all. NOx Conversion efficiency is more of a logic fault, not a sensor problem. From the limited information I have, I can guess that your NOx sensors are working correctly, but it is not sensing enough of a NOx reduction. Meaning you have a problem in the SCR system.
What are the NOx Senor parts numbers for a truck?
BMT Certified Know-It-All! The newest NOx senor part numbers are 21636091 for the pre-SCR (bottom of the DPF) and 22014032 for the post -SCR (SCR box outlet) . Working on a truck now that came in with SCR derated 5MPH. Active codes SPN-4094 FMI-18 and SPN-5394 FMI-17.