According to the AA website, emissions limits that apply to ULEZ are as follows, with values reported on on the Certificato di Confirmita CEE which I have for my 20vt Plus shown in
bold afterwards
Euro 4 emission limits (petrol)
CO – 1.0 g/km
1.337HC – 0.10 g/km
not givenNOx – 0.08 g/km
not givenPM – no limit
not givenSo it fails on CO, but before you get your hopes up on NOx, the total HC+NOx is given as 0.383 vs. the limit of 0.18
The Fiat Coupe is only Euro 2 compliant at best