Altima NOx Sensor Fault

I had a similar problem with my old Saab 9-3. Check engine light, NOx sensor error, all that jazz. For me, it was also the wiring harness. Does the Altima have easy access to the sensor connection?

Thanks. Access to the sensor connection seems straightforward. Did the Saab have any drivability issues with the error code? I'm worried about damage to the catalytic converter.

Yes, it ran rough at times, particularly at lower RPMs. Get the Altima checked out to avoid consequential damage. If you're lucky, cleaning and re-seating the connector may fix it, but NOx sensors are prone to failure. A workshop can test it easily.

I took it to my local workshop, and the NOx sensor's plug had a defective connection, which they repaired. The final bill was 95€. Thanks for the help!