How to fix error code P0420 in Vauxhall Combo Life?

I recently got an error code P0420 in my Vauxhall Combo Life. It says 'Catalytic Converter Efficiency Below Threshold (Bank 1)'. What could be causing this and how can I fix it?

Hi Emily, error code P0420 usually indicates a problem with your catalytic converter. This could be due to a faulty O2 sensor or a damaged catalytic converter. I recommend taking your vehicle to a mechanic to diagnose and fix the issue.

Hi Emily, P0420 can also be triggered by a leak in the exhaust system. I suggest checking for any leaks and repairing them if necessary. If that doesn't solve the issue, it may be a faulty catalytic converter that needs to be replaced.

Hi Emily, before replacing any parts, it's important to make sure the error code is accurate. Sometimes, P0420 can be triggered by a faulty O2 sensor or misfiring spark plugs. I recommend getting a second opinion from a different mechanic to confirm the issue.