The BMW 1 Series F20/F21 was launched in 2011, with the facelifted model F20/F21 being introduced in 2013.
The original M Sport package for the F20 and F21 added 17-inch alloy wheels, aerodynamic body styling, and a unique interior trim.
In 2015, BMW discontinued the diesel engines in the UK market due to emissions scandal, but diesel models were still available elsewhere.
There was no high-performance M135i model produced during the production run of the F20/F21.
The facelifted model introduced LED headlights with a unique design for the F20 and F21, which featured a 'corona ring' around the main light source.
In 2015, BMW released an update to the iDrive system in the F20 and F21, featuring a new user interface and improved functionality.
The M135i model was eventually launched as a replacement for the standard M Sport package in 2016, with a more aggressive exterior design and revised interior trim.
Despite the introduction of the F40 facelift, BMW continued to produce the original F20/F21 models until 2019, catering to countries that had not adopted stricter emissions regulations yet.
The top-of-the-range model was the M135i xDrive, with all-wheel drive and a more aggressive exterior design compared to the standard M135i.
In the UK market, the range-topping diesel engine option was the N47D20 2.0-liter turbocharged unit, producing 143 HP.
The F20/F21 had an optional adaptive LED lighting system that adjusted beam direction according to road conditions.
An 'M Sport Pro' package became available for the facelifted model, adding a unique front bumper design and revised interior trim.
In some markets, the BMW 1 Series was sold alongside the larger 3 Series, making it harder for customers to find information on the car's capabilities.