NOx Sensor Teach-in on your car using a YOUCANIC Scanner | Easy DIY
Have you recently replaced your NOx sensor? Before you can get your car back on the road, you need to program your new sensor! While this may sound like a complex fix, the YOUCANIC scanner makes the process easy!
Demo Model: 2015 Mercedes GL350
Why do I need to program my new NOx Sensors?
Your car’s engine control unit (ECU) communicates with your NOx sensors to keep your car running at its best. If your ECU doesn’t recognize your new NOx sensors, your car will continue to have fuel-efficiency issues and remain stuck in limp mode. Programming your new sensor ensures proper communication with your ECU, keeping your car running efficiently and reducing overall emissions.
🔧 Stop paying the dealer for every warning light
Get dealer level diagnostics at home with the YOUCANIC Full System Scanner.
- ✔ Works with all makes and models, including most luxury brands
- ✔ Topology map view shows all vehicle modules on one screen for faster diagnostics
- ✔ Bi directional controls to test fans, pumps, actuators and more so you do not have to guess
- ✔ Special resets and calibrations such as ABS bleed, EPB service, battery registration and more
- ✔ Free lifetime updates with no recurring fees
Step-By-Step Guide
- Plug your VCI dongle into the OBD-II port in the driver’s side footwell of your car.
- Select Diagnostic from the home screen of your scanner, then select your vehicle make on the next screen.
- Select Smartvin or Manual Entry, then enter any other necessary vehicle information.
- Select Diagnosis, then select Control Modules.
- Select Drive, then on the next screen select Engine Electronics.
- Scroll until you see the NOx Sensor options, and select the option with the code that matches the component you replaced.
NOTE: The screenshot above highlights the component codes found on a Mercedes-Benz. These codes will have a different name depending on the make. - Once you have selected the component that needs to be coded, a pop-up will appear on screen, confirming that you want to perform a teach-in on that component. Press OK, and the Teach-In process will begin.
- Once the new code has been successfully coded, the message “The Learning Process has been carried out successfully.” will appear on your screen.
NOTE: The screenshot above highlights the component codes found on a Mercedes-Benz. These codes will have a different name depending on the make. 
Disclaimer: This guide may not apply to all vehicle makes and models. If you need to verify coverage for your particular vehicle, please contact YOUCANIC support or use our Compatibility Checker.
How do I know if my NOx sensor needs to be replaced?
If the check engine light is on and your car is experiencing reduced fuel efficiency, your NOx sensor might be the issue. Don’t stop blindly swapping parts, confirm the NOx sensor is the culprit, run a quick scan, and monitor live data using a YOUCANIC scanner to confirm!
Other components that could be causing reduced fuel efficiency include transmission issues, low coolant levels, or faulty sensors, like your NOx or MAF sensors.
Need some extra help? Get real, helpful answers from real mechanics with YOUCANIC DIY Assist support. Email our support team and get a reply within 24 hours to help you with any technical questions you may have.
