BMW 4 Series 2020–2024 car dimensions: 4768 mm long, 1852 mm wide and 1384 mm high. Unladen weight is 1,765 kg. Braked towing is 1,600 kg.
Three-zone automatic climate control is standard. Wireless Apple CarPlay and Android Auto come as standard with a touchscreen control display. Cruise control with braking function, front and rear parking sensors, front collision warning with brake intervention and lane departure warning with steering assistance are standard. Blind-spot warning and a reversing camera sit in optional packs on many European specs.
Boot holds 385 litres with the roof closed and 300 litres with it open thanks to the variable soft-top compartment. Folding rear backrest and through-loading are standard.
Braked towing capacity is 1600 kg and unbraked 750 kg. Payload is 495 kg. No heavy-duty cooling is listed. M Sport suspension is an option for firmer support.
The cabin feels driver-focused and enveloping, with high centre console and coordinated surfaces around the sports seats. Electrically adjustable front sports seats with memory come standard, along with Vernasca leather and heated front seats. Three-zone automatic climate control is standard. The multi-layer panel-bow soft top delivers strong acoustic and thermal comfort when closed, quieter than a conventional fabric roof. Optional neck warmers in the front headrests and a stowable wind deflector help with open-top driving.
2.0-litre petrol engine, combined fuel use 5.7-6.1 l/100 km (NEDC), Euro 6d.
Condition Based Service. oil service typically every 30 000 km or 24 months.
Euro NCAP 5 stars (adult occupant 96 %, child 80 %).
Standard safety: front collision warning with braking, lane departure warning with steering return, Speed Limit Info, front/rear PDC, multiple airbags including knee, roll-over protection, DSC.
The 420i Cabriolet runs a 1998 cm³ four-cylinder petrol engine with 135 kW/184 hp and 300 Nm. Official combined consumption is given as 5.7-6.1 l/100 km with CO2 of 131-140 g/km under the NEDC cycle used at launch. later WLTP figures are higher. All variants meet Euro 6d.
Servicing follows BMW’s Condition Based Service system, which calculates intervals from actual use. Oil and filter changes are commonly indicated at up to 30 000 km or two years, whichever comes first. The soft-top mechanism itself is described as maintenance-free.
Euro NCAP awarded the G23 Convertible five stars. Adult protection scored 96 % and child protection 80 %. The body structure uses extra side sills, bracing and an aluminium front shear panel for convertible-specific rigidity. Standard equipment includes driver and passenger airbags, side and head airbags, a driver knee airbag, seat-belt tensioners, roll-over protection bars, tyre-pressure monitoring, DSC with ABS and cornering brake control, plus front collision warning with city brake function and lane-departure warning with steering assistance.
Run-flat tyres are fitted on many versions. The variable soft-top compartment gives 300 litres of boot space with the roof down and 385 litres when closed. Folding rear backrests and through-loading are standard, helping everyday usability.
Length 4768 mm, Width 1852 mm, Height 1384 mm, Wheelbase 2851 mm (4 Series 2020–2024)
Sources: manufacturer data, BMW Media Information, Technical specifications, BMW 4 Series Convertible, 420i, valid from 03/2021, ACEA markets, weight homologation in part only, 59 l, DIN/EU unladen weight 1690/1765 kg, 2 doors and 4 seats, luggage compartment.