How to check if the NOx sensor is working?
The nitrogen oxides (NOx) sensor plays a key role in the system of reducing harmful emissions in car exhaust gases. It monitors the concentration of nitrogen oxides in exhaust gases, which allows for effective management of the operation of the SCR (Selective Catalytic Reduction) catalytic converter. The efficiency of this sensor is therefore important not only for the environment, but also for optimal engine operation and driving economy. How to recognize its failure? We will answer this question and other issues related to the operation of the nitrogen oxide sensor in this article.
NOx sensor failure – why does this problem need to be solved?
A NOx sensor failure can lead to a number of problems that impact not only the environment, but also vehicle performance and economy. A faulty sensor can cause emission reduction systems to malfunction, which in turn results in increased emissions of harmful nitrogen oxides, higher fuel consumption, and even damage to other vehicle components.
Therefore, a NOx sensor failure causes greater environmental pollution, but also worsens driving economy, which may be of key importance, especially for fleet owners who use vehicles for professional purposes.
What may indicate a NOx sensor failure?
There are several symptoms that may indicate problems with the NOx sensor. They are quite easy to notice, especially because they have a significant impact on the car’s performance. The most common symptoms of a damaged nitrogen oxide sensor include:
engine light coming on – this is usually the first and most obvious sign that something is wrong;
increased fuel consumption – a faulty sensor may contribute to the dosing of an incorrect amount of exhaust gases in the combustion chamber. In turn, a mixture with an inappropriate composition may contribute to increased combustion;
reduced power – for the same reason the engine may have problems achieving its maximum capabilities;
switching to emergency mode – the car automatically limits its performance to prevent further damage;
Reduced acceleration – Reduced engine performance may cause acceleration problems, contributing to uneven engine operation or jerking.
Unfortunately, these symptoms are not characteristic of a NOx sensor failure and may indicate many other problems in the engine or exhaust system. Therefore, noticing this problem requires taking immediate steps, i.e. diagnosing and eliminating the fault.
How to recognize a NOx sensor failure?
Solving the problem requires making a correct diagnosis. This is important because it allows you to avoid unnecessary repairs of functional elements that would not bring the expected results and, therefore, still expose the vehicle to more serious damage related to the failure of the nitrogen oxide sensor. To precisely diagnose the problem with the NOx sensor, it is recommended to use professional diagnostic methods.
Connecting the vehicle to a diagnostic station
The diagnostic station, using specialized software, is able to precisely determine whether and what problem there is with the NOx sensor. Reading error codes from the car’s on-board computer provides precise information about the technical condition of the sensor.
Diagnosis using a multimeter
Advanced users or mechanics can also use a multimeter to check that the NOx sensor is generating the correct voltage and that its electrical circuit is OK. However, this method requires appropriate knowledge and experience.
You should also use an oscilloscope to determine whether the wires between the sensor and the CAN bus conduct the impulse correctly. If there are no problems in this area, the problem may be with the sensor.
How to solve the problem of NOx sensor failure?
If a NOx sensor failure is detected, it may be necessary to replace it with a new one. However, it is also worth considering the option of purchasing an OEM nitrogen oxide sensor. The OEM version of NOx sensors retains full technical and operational efficiency, which may be a more advantageous solution from both a financial and ecological perspective. OEM sensors in the Arcoore offer are fully compatible with the ECU (Engine Control Unit) of the vehicle in which they are installed.
Correct diagnosis and repair of the NOx sensor are crucial to maintaining optimal engine operation and minimizing the vehicle’s negative impact on the environment. Regular inspections and maintenance are the best strategy to prevent more serious NOx sensor problems. New OE and New OEM nitrogen oxide sensors for trucks of various brands and years can be found in the Arcoore offer.
