Lexus UX rough running exhaust smell

Hey, my 2022 Lexus UX with a gasoline engine is throwing me for a loop. I've got 237371 km on the clock and the check engine light is on. It's running rough, I can smell exhaust fumes, and it seems like there's a leak somewhere. Could it be a faulty NOx sensor or maybe something with the EGR valve?

4 comment(s)

Sounds familiar! I had similar symptoms on my UX. Rough running, exhaust smell... did you also notice any difference in fuel economy? Have you checked the exhaust pipe for visible damage or leaks around the oxygen sensor?

Yeah, the fuel economy seems a bit worse than usual. You mentioned oxygen sensor - do you think it's more likely that than, say, the catalytic converter?

In my case, it turned out to be a defective lambda sensor, so the oxygen sensor. Like a faulty thermostat, it was messing with the whole system. But it is best you go to the workshop to make sure.

Thanks for the info! I took it to the shop, and you were spot on. It was a defective lambda sensor. Repair cost me 375€. Appreciate the help!

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