theresajones34
Mini Cabrio check engine light and exhaust issues
Summary of the thread
The 2019 Mini Cabrio had a check engine light, rough engine performance, and a strong exhaust smell. Diagnostics suggested an exhaust treatment malfunction, potentially due to a faulty lambda or NOx sensor. The issue was resolved by replacing a defective oxygen sensor, which eliminated the check engine light and improved engine performance.
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4 comment(s)
theresajones34 (community.author)
EGR valve issues with a gasoline engine? Isn't that more common on diesels? And no, I haven't visually inspected the exhaust pipe yet. Where exactly should I be looking for cracks?
luise_krause2
Yes, my bad, was thinking of the NOx sensors since you mentioned those. Sorry for the confusion. Regarding the exhaust pipe, check around any joints or welds, especially near the catalytic converter. Honestly, though, with those symptoms and mileage, it's probably best to get it checked by a workshop. They can test the oxygen sensor properly.
theresajones34 (community.author)
It was a defective oxygen sensor, like you thought. I replaced it, and the check engine light is off, no more rough running or exhaust smell. Cost me 375€. Thanks for the help.
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MINI
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CABRIO
luise_krause2
Sounds familiar. I had similar symptoms a check engine light, rough idle, and a strong exhaust smell with my old sedan. It turned out to be a faulty EGR valve messing everything up. Do you notice any difference when the engine is cold versus warm? Have you checked for any obvious cracks or leaks in the exhaust pipe between the catalytic converter and the engine?