Lexus NX NOx Catalyst Aging

I also own a Lexus NX, although I'm not sure about the year. This sounds like the catalytic converter issue I faced! It's like a ticking time bomb that reduces fuel efficiency. Did you notice any strange smells, or is it just the light and exhaust?

Just the light and exhaust. No strange smells. You think it's the catalytic converter even with the exhaust leak? Should I be worried about NOx emissions?

With the exhaust leak, it's almost certainly affecting the catalytic converter's performance. Think of it like a punctured tire - it still works, but not as well! I would strongly advise getting it checked at a workshop ASAP to confirm.

Thanks! Workshop confirmed exhaust leak, replaced the NOx storage catalyst. Repair cost 265€. All good now.