Renault Fluence NOx Sensor Failure

Hi, I have a 2016 Renault Fluence with a gasoline engine. Recently, the check engine light came on, and the error memory shows a NOx sensor failure. I also noticed an exhaust leak. Could a defective cable or plug connection be the problem?

4 comment(s)

Hey! I had a similar issue with my Opel Astra a while back. It also turned out to be a NOx sensor problem. The symptoms were almost identical: check engine light, error code related to the sensor, and a weird smell, though I didn't notice a leak. Have you tried inspecting the sensor's connector and wiring for any obvious damage?

Thanks for the tip! I did a quick visual check, but didn't see anything obvious. Where exactly should I be looking, and what kind of damage am I looking for? Is there a way to test the sensor or the wiring harness?

Well, on my Astra, the issue was corrosion inside the connector itself. It wasn't immediately visible. Honestly, without the right tools and knowledge, testing the sensor and wiring can be tricky. Given the exhaust leak too, I'd recommend taking it to a workshop. They'll diagnose it properly, and the part plus labor cost me about 95€ to fix.

Thanks a lot for the advice! I'll take it to a workshop to have it checked out. Hopefully, it's just a simple fix like yours was. I appreciate the help!

Join the discussion now: