Failed Emissions - help

[SaracenUK]

2012 1.2 TSI 79,000 miles, been off the road for 12 months or more.
Took it for a good run then onto an MOT to fail on emissions.
Any ideas ?

 

[mty12345]

probably cat not working properly. Could be clogged up if sat for that long. Could also be a rich mixture, but unlikely when the HCs are so low

 

[AlperUtkuCeylan]

Before going there, if possible go for a autobahn drive when the oil heats drive with higher rpms than normal. After that go to the emission tests with warm engine. I did like this with our old Toledo and never failed

 

[SaracenUK]

Forgot to mention, had a P0135 and P2251 showup.
Changed out the upstream O2 sensor for a known good one and got it retested. still no good.
Looks like its the catalytic converter