What Does the Error Code P0420 Mean on my Vauxhall Astra?

I recently saw the check engine light pop up on my Vauxhall Astra and after running a diagnostic, I got the error code P0420. Can someone please explain what this code means and how I can fix it?

The error code P0420 indicates an issue with the catalytic converter in your Vauxhall Astra. This can be caused by a variety of reasons, such as a faulty oxygen sensor or a clogged converter.

I suggest taking your car to a certified mechanic to properly diagnose and fix the issue. Attempting to fix it yourself may cause further damage.

If your vehicle is still under warranty, you may be able to get the catalytic converter replaced for free. It's worth checking with your dealership.