Code P0420 - Cat or sensors?

The engine warning light has come up on my 51 plate Jimny, and the code reader has come up with the code P0420. After Googling around, it could be the Cat itself, or one of the sensors.

In the forums' experience, what is it likely to be?

The light did appear on my way to Norfolk last weekend, and I have ended up doing about 150 miles since, so am I likely to have made things worse? Performance seems to be OK, no worse than before, and the MPG is OK, as expected really.

Reset the code and see if it comes back on before assuming the worst

best thing you can do its take it to an mot place and ask to do an emmisions test on it that will tell you if the cat is cuput by the co level and if the lambda reading is high it will be one of the sensors if you have to of them or and exhaust blow

KwikFit do a free Exhaust/Cat check. Have booked one on-line. I cant post the link because the forum thinks I am spamming, so just go to the KF site and the option is obvious.

Oh no! I'm a spammer too and I've generated an administrative alert.

Just likje at work when the sweary obscenity filter reported me for the word Christmas in an email :ohmy:

Go to youtube and search for 5icTmYItwiE

GuardianAngel wrote: KwikFit do a free Exhaust/Cat check. Have booked one on-line. I cant post the link because the forum thinks I am spamming, so just go to the KF site and the option is obvious.

Betcha you end up needing a complete new exhaust, 4 tyres 4 shock absorbers, brake disks and pads too.