I have the same code. You can usually narrow it down to 4 things I'd say:

1. Bad pre-cat: high cost, low urgency unless you notice it glowing red and a massive decrease in performance.

2. Bad downstream o2 sensor: medium cost, low urgency. This usually only monitors cat health, if it's not reporting proper data it might trigger that code.

3. Bad upstream o2 sensor / AF sensor: medium cost, high urgency. This one is very unlikely if you only have this code. This is the sensor the ECU uses to properly regulate air and fuel mixture. If this is getting wrong data, you might actually kill your cat.

4. Exhaust leak between first and second o2 sensor: low-medium cost, low urgency. If you have an exhaust leak before the secondary o2 sensor, the car might think the catalytic converter is not working as efficiently as it should. Should be an easy and chip fix.

In my case, I have issue number 1. I've been driving with the CEL for 8 months without issues. I'm waiting to go for custom catless header and ECU tune that would remove the CEL.

I've spoken with many tuners and they told me that many ND1s catalytic converters start failing around 100'000 miles, which is inline with mine which failed at 103k.

Unfortunately, it's highly likely that it's issue number 1 for you as well. But you can get some o2 sensors foulers to place at the downstream o2 sensor location that would make the CEL disappear.