NOx Catalyst and Exhaust Leak Concerns

The presence of a NOx storage catalyst aging error alongside an exhaust leak suggests a likely connection. The NOx storage catalyst is a crucial component in your emissions system, designed to reduce nitrogen oxides (NOx) – harmful pollutants – in the exhaust gases. A leak in the exhaust system, especially before the catalytic converter, can disrupt the delicate balance required for the catalyst to function efficiently. This disruption can lead to inaccurate readings by the sensors monitoring the catalyst's performance, triggering the error code. It is important to determine the location of the leak. Is it before or after the catalytic converter?

How can I tell if the leak is before or after the catalytic converter without taking everything apart? I'm trying to avoid unnecessary work, if possible. Also, does this mean my catalytic converter is probably fine?

Determining the exact location of the leak without specialized equipment can be challenging. However, a careful visual inspection of the exhaust system, starting from the engine and moving towards the rear of the vehicle, can sometimes reveal obvious signs of a leak, such as soot deposits or damaged components. It's difficult to say definitively if your catalytic converter is still fully functional without further car diagnostics, but addressing the exhaust leak is the necessary first step. I would recommend taking your vehicle to a qualified technician for a thorough inspection. They can accurately pinpoint the leak and assess the condition of the NOx storage catalyst.

I'll take it to a workshop and have them check for exhaust leaking. They located an exhaust leak and fixed it for 265€. Seems like that was the whole problem. Check engine light is now off. Really appreciate the advice!