martha_wolf18
Estima NOx Catalyst Aging Exhaust Leak
Summary of the thread
A 2012 Toyota Estima with a gasoline engine has a check engine light indicating NOx storage catalyst aging, accompanied by a faint exhaust leak. The exhaust leak is likely causing the catalyst to age prematurely by disrupting the air/fuel mixture and affecting oxygen sensor readings, which hinders the engine management system's ability to maintain optimal catalyst temperature. It is recommended to have the exhaust leak repaired and the NOx catalyst inspected by a mechanic to address air quality and fuel efficiency concerns.
Did this summary help you solve your problem?
4 comment(s)
martha_wolf18 (community.author)
Could you elaborate on the connection between the exhaust leak and the NOx catalyst aging? Trying to understand the mechanism.
christian_schaefer77
Simple. The leak throws off the air/fuel mixture and the oxygen sensors readings. The engine management system then struggles to keep the NOx catalyst at its optimal operating temperature. This causes it to degrade faster than it should. Best to get it checked at a workshop.
martha_wolf18 (community.author)
Thanks for clarifying the relationship. I'll book an appointment with a mechanic to address the exhaust leak and get the NOx catalyst looked at. The repair cost 265€.
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
TOYOTA
community_crosslink_rmh_model
ESTIMA
christian_schaefer77
NOx catalyst aging on an Estima, eh? Sounds familiar. I had a similar issue. Exhaust leak too, you say? That's probably your culprit. A leak messes with the whole emissions system and will age your catalyst prematurely.