Tesla qualifies for EU super-credits which allow a trade-off of electric car sales against ICE vehicles. Tesla has already sold $280 million dollars in 2017 in California.
Fiat Chrysler previously had an $8000 million fine in the USA for using software to falsely pass emission tests. Fiat Chrysler was looking at billions in EU fines without the Tesla deal.
Beginning in 2020, 95% of automotive fleet-wide emissions in the EU must average under 95g of CO2 per kilometer and have a fuel efficiency of about 57 mpg for internal combustion vehicles. In 2021, the vehicle full fleets must be compliant.
Fiat Chysler's fleet is about 30 gram of CO2 per kilometer too polluting.