# Emissions E321

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Emissions
- NHTSA id: 11014762
- Published by NHTSA: 2025\-03\-04
- Manufacturer's number: E321
- Manufacturer's date: 2025\-03\-01
- Campaign id or software version: E321
- NHTSA component: ENGINE

## NHTSA's summary

Certain chassis equipped with a PACCAR MX\-11 EMY18 engine are eligible to receive software improvements to increase vehicle uptime and functionality of emissions fault detection. The software updates will allow Forward NOx sensor deviations to be detected prior to OBD Emission Limit \(OBDEL\) exceedance.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014762-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014762-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2018 to 2020 PACCAR MX\-11

JSON: [/v1/bulletins/11014762](/v1/bulletins/11014762)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Emissions%20E321&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11014762&vehicle=Emissions%20E321)