ninafrost1

Rogue exhaust treatment malfunction

Hey, I've got a 2014 Nissan Rogue with a gasoline engine that's giving me fits. Check engine light popped on, and the engine's running rough, especially at idle. I can smell exhaust pretty strongly, and I think I might even hear a small leak under the car, closer to the front. My scanner is showing codes related to exhaust treatment malfunction. Mileage is pushing 237k km. I was thinking maybe EGR valve, catalytic converter or even the particulate filter, but those seem unlikely. Could it be a dodgy oxygen sensor causing all this chaos?

A 2014 Nissan Rogue with a gasoline engine is experiencing rough idling, a strong exhaust smell, and a check engine light, with diagnostic codes indicating an exhaust treatment malfunction. The potential causes considered include a defective EGR valve, catalytic converter, or particulate filter, but the focus shifts to a possible faulty oxygen sensor. After professional diagnosis, it is confirmed that a defective lambda sensor was the issue, and replacing it resolved the problem.

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4 comment(s)

Rough running, exhaust smell, and a CEL on a Rogue of that vintage points towards a few things. Have you noticed any change in fuel economy? An exhaust leak could definitely contribute, but so could a failing catalytic converter or an aging oxygen sensor. When was the last time you checked the condition of your exhaust manifold?

Fuel economy seems normal, actually. The exhaust manifold looks alright visually. I checked for cracks, but it's hard to get a good look without taking everything apart. Given the exhaust treatment code, does that lean more towards the lambda sensor or a potential clog in the catalytic converter? I'm trying to avoid replacing parts unnecessarily.

Considering the exhaust treatment code and the O2 sensor's role in monitoring catalytic converter efficiency, I'd put my money on a defective lambda sensor. However, an exhaust leak before the cat could also skew the readings. At this point, it might be wise to get a professional diagnosis. They have tools like smoke testers that can pinpoint leaks, and diagnostic equipment to properly test the O2 sensor functionality.

Thanks for the insights. I took it to the shop. Turns out it was indeed a defective lambda sensor, like you suspected. Cost me 375€ to get it replaced. Runs like new again!

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NISSAN

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ROGUE