sinakrueger6
Skoda Karoq NOx Catalyst Issue
Summary of the thread
A 2017 Skoda Karoq with a gasoline engine and 25,513 km showed a check engine light due to a NOx storage catalyst aging issue, accompanied by a slight exhaust leak. The problem was suspected to be linked to the emissions system, potentially caused by the exhaust leak affecting the catalyst's function. A smoke test at a workshop identified the leak near the NOx catalyst, which was then repaired by welding, resolving the issue without needing a costly catalyst replacement.
Did this summary help you solve your problem?
4 comment(s)
sinakrueger6 (community.author)
Thanks for the quick response! You mentioned a leak in the exhaust system. Where exactly was the leak located in your case? Was it near the NOx catalyst itself, or somewhere else along the exhaust line? And how did you find the leak, just by visual inspection or did you use some kind of diagnostic tool?
manfredlorenz1
Yes, it was incredibly similar! For me, the leak was right where the exhaust pipe connects to the NOx catalyst. A visual inspection didn't reveal much initially, but the workshop used a smoke test to pinpoint the exact location. I understand your concern about the cost; a new NOx catalyst can be very expensive. Given your symptoms (check engine light, error code, exhaust leak), it's highly probable that the leak is the primary cause of the issue. My advice would be to get the exhaust system professionally inspected and repaired before considering a NOx catalyst replacement. I would strongly recommend taking it to a workshop.
sinakrueger6 (community.author)
Took the Karoq to the workshop and they confirmed a small exhaust leak near the NOx catalyst. They welded it, and the check engine light is gone! Total cost was 265€, which I'm happy with considering the alternative. Thanks again for your help, it really pointed me in the right direction!
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
SKODA
community_crosslink_rmh_model
KAROQ
manfredlorenz1
Interesting issue! I had something similar with my Karoq – also a petrol engine. The check engine light kept coming on, and the error code pointed to the NOx catalyst. Have you checked your exhaust system for any leaks? Even a small one can throw off the readings and trigger that error. I remember that a leak can allow unburnt fuel/air mixture to reach the catalyst, interfering with its function. Is the exhaust louder than usual, or do you smell any exhaust fumes inside the cabin?