NOx Sensor Problems

As with many electronic components that serve such a significant purpose, NOx sensors, unfortunately, have a limited lifespan, which means that you’ll need to expect to change them at some point during vehicle ownership.

Once the NOx sensor stops emitting a signal within a specific bandwidth, it will flag up an error within your ECU (Engine Control Unit), which is likely to cause the vehicle to go into ‘Limp Mode’, otherwise known as ‘Emergency Mode’.

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.

In most cases, you can expect it all to be rather dramatic, and it’s at this point that a broken NOx sensor should be a consideration.