jan_krueger5

Check Engine Light and Exhaust Smell

Alright, I'm scratching my head here. My 2018 Mini Countryman is throwing a check engine light. The error memory says it's related to NOx storage catalyst aging. I also noticed a slight exhaust leak smell. Could a leak in the exhaust system actually cause this, or am I looking at a bigger problem with the emissions system?

A 2018 Mini Countryman displayed a check engine light with an error related to NOx storage catalyst aging, accompanied by a slight exhaust smell. The issue was suspected to be an exhaust system leak, potentially affecting sensor readings and triggering the error. A cracked exhaust manifold was identified as the cause, and replacing it resolved the problem, likely improving fuel efficiency and emissions system performance.

Did this summary help you solve your problem?

4 comment(s)

I had a similar issue with my Mini not a Countryman, but still. Check engine light and exhaust smell inside the cabin. I'd start by visually inspecting the exhaust system for any obvious cracks or leaks before condemning the NOx catalyst or catalytic converter. Is it running rough or just showing the light?

Thanks, that's helpful. It's running fine, no noticeable difference in performance. Just the check engine light and the error code related to NOx storage catalyst aging. Where exactly on the exhaust system did you find the leak?

Mine was a crack in the exhaust manifold, pretty common apparently. Since you smell exhaust, it's almost certainly a leak somewhere. The sensor readings get thrown off, which can trigger the NOx catalyst error. Best bet is to take it to a workshop and have them do a smoke test to pinpoint the leak.

Thanks for the insight. Turns out it was a cracked exhaust manifold. New one fitted, total cost 265€. Hopefully, fuel efficiency will improve now, and the emissions system will be happy.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

MINI

community_crosslink_rmh_model

COUNTRYMAN