This video is all about the handling and installation of new NOx sensors from the mechanic's point of view.

What are NOx sensors?
NOx sensors measure the concentration of nitrogen oxides in the exhaust gas and convert them into usable signals for engine management. These signals control exhaust gas aftertreatment and help to keep emissions as low as possible. They are essential for passenger cars, light commercial vehicles and heavy commercial vehicles with gasoline or diesel engines.

Correct installation of NOx sensors
The installation of a NOx sensor is not a plug-and-play solution. They consist of a sensor module, connecting cable and control unit, which are calibrated at the factory. They must not be replaced individually. Do not use silicone sprays, oil sprays or grease in the area of the sensor, as this may impair its function.

Troubleshooting and condensation
Please note that the sensor material can absorb moisture from the air if it is stored for a long period of time. This fault usually disappears after the first heating. If you notice a lot of condensation in the exhaust, drive your vehicle extensively to remove condensation from the exhaust system before installing the sensor.

Additional diagnostics in the event of discoloration
After removing the old sensor, you should check the sensor head for discoloration: Black due to oil or white due to excessive urea injection require additional diagnostics on the vehicle to prevent recurring damage.

Installation tips for the new NOx sensor
Before installation, be sure to check the threading in the exhaust system. Make sure that the connecting cable is securely clipped into the vehicle-specific fixing points and that the cable is not chafed or pinched.

Protection against water damage
Corrosion can occur due to water entering the plug connections, particularly in the case of sensors on the underbody. Check these thoroughly before installation.

Configuration and adjustment
After installing the NOx sensor, it must be configured using a diagnostic device. Connect a battery charger for a stable power supply and start the adjustment. A test drive is then required to ensure functionality.

Protective cover and sensitive handling
Do not forget to remove the protective cap from the sensor head before installation. The NOx sensor is a precise measuring instrument, so handle the entire unit with care - avoid heavy mechanical loads.