R134A gas is common in vehicles manufactured before 2014. All vehicles with air conditioning manufactured since 1st January 2017 include the new R1234YF air con gas which is more environmentally friendly. Since this date, manufacturers are no longer allowed to use the older R134A air con gas in a bid to reduce global warming as the old gas is believed to be more damaging to the environment. R1234YF gas was phased in by vehicle manufacturers over time so vehicles rolling off the production line between 2014 and 2016 could require either gas.