company news about What happens when a NOx sensor goes bad?

When a NOx sensor fails, the following consequences may occur:

Excessive emissions: The sensor cannot accurately detect the concentration of nitrogen oxides (NOx) in the exhaust gas, causing the vehicle's emissions to exceed environmental standards.
Degraded engine performance: The ECU may limit power output due to lack of accurate data, causing problems such as slow acceleration and insufficient power.
Increased fuel consumption: The fuel system may adjust the air-fuel ratio due to abnormal emission control, resulting in reduced fuel efficiency.
Triggering the fault indicator: After the ECU detects an abnormal sensor signal, it usually lights up the fault light on the dashboard and stores the relevant error code.
Failure of the exhaust treatment system: If the sensor heating circuit or probe is damaged, it may cause the post-treatment system such as SCR (selective catalytic reduction) to be unable to accurately inject urea, further exacerbating pollution.

Common causes of failure:

Sensor probe is contaminated, aged or physically damaged;
Line short circuit, open circuit or poor contact of the connector;
Control module (such as ECU) communication abnormality or program error;
Fuel quality problems cause abnormal exhaust composition, interfering with sensor detection.

Temporary countermeasures:

Clean the dirt on the probe or check whether the wiring harness is firmly connected;
Quickly manually reset the sensor after powering off (only applicable to some models).

Note: The above method can only temporarily relieve the symptoms. In the long term, the sensor needs to be replaced or the line needs to be repaired to completely solve the problem.

Website:www.enginenoxsensor.com