Why did the emissions for the Ford Fiesta 1.25 Zetec change?

The emissions on the Ford Fiesta 1.25 Zetec were 120g/km, which put it in band C, Euro 5 and £35 tax. Then in Jan 2015 the emissions suddenly went to 122g/km and went into band D, Euro 6 and £150 tax. I understand the emissions scenario, but were the emissions manipulated. I was going to buy a Ford Fiesta, but it was £150 to tax, but found one registered two days earlier at £35 to tax!

Asked on 10 January 2024 by Andrew Carter

Answered by David Ross
During the lifespan of a car in production it is not uncommon for changes to the vehicle to occur, whether it is a required mechanical change or even a change in the way performance is calculated, which can result in a change such as this. A difference of 2g/km is a small change in the grand scheme of things, it just happens to result in a significant change in the rate of VED due to the rules at the time.
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