michaelshadow1

Nitrogen Oxide Sensor Issue and Exhaust Leak

My 2005 Mercedes CLK, gasoline engine, is displaying a check engine light. The error codes point to a faulty nitrogen oxide sensor. I also noticed a slight exhaust leak. I suspect the cable or plug connection of the component is defective. Has anyone experienced similar issues? What am I looking at in terms of repair?

4 comment(s)

I had a similar issue with my old Volvo. The check engine light came on, and the error code also pointed to the emission sensor. In my case, it was on a diesel engine though, not gasoline. Did you check the sensor's connector? Is it corroded or loose? Also, are you sure it's an exhaust leak and not just condensation?

Thanks for the insight. I visually inspected the connector, and it appears fine, no obvious corrosion. Regarding the exhaust, I can definitely smell it, so I'm pretty sure it's a leak and not just condensation. Any ideas what else could be going on? Did you manage to fix the issue on your Volvo?

Yes, the exhaust leak might complicate things. On my Volvo, the connector looked fine too, but the mechanic found a tiny crack in the wire insulation. I was getting erratic readings from the nitrogen oxide sensor, triggering the check engine light. If you are smelling exhaust, you should get it to a workshop as soon as possible. That is what I did with my Volvo

Understood, I appreciate the confirmation. I will take it to a workshop. For those interested, the bill came to 95€. It turned out to be the cable, as initially expected.

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