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72 BMW 4 Series 420i M Sport 2dr Step Auto [Pro Pack]

Only £42,998 Save £6662 on cost new today
£3999 Deposit
£599 Per month

Featured specification

Standard specification

Driver Convenience

Active guard plusAttentiveness assist
Auto start-stopBMW ConnectedDrive online services
BMW Live Cockpit Professional Nav with 12.3" instrument display + 10.25" display, Intelligent Voice Assist, BMW OS 7, HDD, 2USB, 4G LTE connectBMW service history
BMW TeleservicesBrake pad wear indicator in front and rear
Check Control warning system for monitoring of lights and door/luggage compartment open warningCondition based service
Cruise control with speed limit functionElectric power steering with Servotronic steering optimised at all speed ranges
Gearshift time display in manual modeiDrive controller on centre console
Instrument cluster with speedometer with mph readout, tachometer, fuel gauge and oil temperature gaugeIntegrated owners handbook
Oil sensor for level and grade, warning by check control systemOn board computer - average speed, fuel consumption, outside temp display with acoustic warning, clock/date, service interval, odometer/trip meter
Optimum shift indicatorRun flat indicator
Shifting point displayVariable sport steering


8 speed automatic steptronic transmission with gearshift paddlesActive sound design
Adaptive M suspensionBalanced 50/50 weight distribution
Double joint spring strut front axleDouble VANOS
Drive performance control - ECO PRO, comfort and sport modesHigh precision injection
Low centre of gravityPetrol Particulate Filter
Sprint modeStroke dependent dampers
VALVETRONIC engine management 


2x USB Type C ports in front centre console for charging and data transfer2x USB Type C ports in rear centre console for charging
DAB tunerElectronic service booklet

Exterior Features

Acoustic glazingAutomatic headlight beam throw control with load dependent regulating reaction, dynamic compensation of braking dive and acceleration squat
Automatic windscreen wipers and automatic headlightAutomatically dimming electrochromatic rear view mirror
BMW emblem on engine compartment lid and tailgateBMW Individual high gloss shadow line with extended contents
BMW individual lights shadow lineBody colour fuel filler flap
Body colour roof finBrushed aluminium inserts in the front door sill finishers with BMW designation
Door sill stripsDynamic brake lights
Electric windows - front and rear, with open/close fingertip control, anti trap facility and comfort closing function all roundExterior mirrors - electrically folding with anti-dazzle
Fading supportFollow me home headlights
Front and rear bumper systemFront apron plastic in body colour
Green tinted heat protection glazingHigh gloss shadow line exterior trim
Illuminated bow type door handles in body colour drivers side with door lockInterior rear view electrochromatic mirror with automatic anti dazzle function
LED daytime running lightsLED front fog lights
LED front indicatorsLicence plate panel integrated into front bumper and tailgate
Lightweight engineeringM designation on front side panels, left and right
Model designation on right side of tailgateOne piece front bumper cover including towing eye cover in body colour
Preparation for high beam assistantRear boot
Reversing lightSide frame decorative moulding black matt
Third brake lightTwo part LED tailights in L-shape with components in smoked glass, brake light, LED turn indicator and rear fog light
Visible exhaust tailpipe finisherVisible VIN plate
Welcome lights in interior and door handle areaWidened track and increased camber values for max transverse dynamics, agility and steering precision
Window recess cover black high glossWindscreen wipers with integrated heated washing jets

Interior Features

12V power socket in front centre console2 2nd row folding seats
2 front cupholder in centre console with clamping elements and matt black inlay2 Rear seat headrests
2nd row centre armrest with built-in cupholders3 spoke M sport leather multifunction steering wheel
3 zone automatic air conditioning4 pieces lashing eyelets in luggage compartment
Armrest integrated in front and rear door trim + front centre console armrestBMW ID
Electric seat adjustment with memoryFour grab handles integrated in roof lining
Front and rear door pocketsFront and rear reading lights
Front sport seatsHeated driver and front passenger seats
Height adjustable front headrestsHeight adjustable mechanically and infinitely variable steering column
Illuminated armrest storage compartmentIlluminated glove compartment with separate small compartment
Make-up mirror lightsSingle front passenger seat
Storage compartment in rear centre consoleSunvisors with illuminated vanity mirrors and ticket pocket
Through load systemToolkit located in luggage compartment
Velour front floor matsVernasca leather upholstery


Ambient lighting pack - 4 SeriesConnected professional pack - 4 Series
M sport exterior styling pack - 4 Series 

Passive Safety

2 x 3-point rear seat beltsBattery safety cut-off
BMW emergency callBrake energy regeneration
Braking pre-tensioningChild seat ISOFIX attachment for the two outer rear seats
Coasting in idle in ECO PRO modeCornering brake control (CBC)
Crash sensor activating of airbags,Unlocking doors,hazard warning lights,fuel cut off,interior lighting+activation of safety battery terminal clampDriver and front passenger side airbags, integrated in the door side seat backrest bolsters for all seat variants
Driver/Front Passenger airbagsDry braking
Dynamic brake controlDynamic stability control + (DSC+) - Anti-lock Braking System (ABS) with brake assist and cornering brake control + Automatic Stability Control (ASC)
Dynamic Traction Control - DTCElectromechanical parking brake including automatic hold function and automatic release of the parking brake when pulling away
Electronic differential lock control (EDLC)Front and rear ventilated brake disc
Front passenger manual airbag deactivationHead airbags for all 4 outer seats
Hill start assistantM Sport seatbelts
Seat belt security check for driver and front passengerSeat belt with belt stopper, pyrotechnic belt tensioners and belt force limiters
Seat occupancy detection for driver and passenger sideSide impact protection
Tyre pressure monitoring with three level warning strategyWarning triangle and first aid kit


Alarm system (Thatcham 1) with remote control and electronic engine immobiliserCentral locking switch for all doors, fuel filler cap and luggage compartment
Remote control with integrated key one button open/close vehicle and windows, sole opening of the luggage compartment lid and panic modeStart/stop button with Comfort Go keyless engine start and auto Start/stop deactivation button
Vehicle key with M specific designation 


Sensatec instrument panel 


19" M light double spoke bicolour jet black alloy wheels - Style 797M with mixed tyres and run flat tyresReduced rolling resistance tyres
The vehicle information above was correct at time of manufacture. Please speak to the dealership for full current specification.

Technical specification

Emissions - ICE

Standard Euro EmissionsEURO 6WLTP - CO2 (g/km) - Comb160
WLTP - CO2 (g/km) - Comb - TEH161WLTP - CO2 (g/km) - Comb - TEL154
WLTP - CO2 (g/km) - Extra High157WLTP - CO2 (g/km) - Extra High - TEH158
WLTP - CO2 (g/km) - Extra High - TEL150WLTP - CO2 (g/km) - High138
WLTP - CO2 (g/km) - High - TEH139WLTP - CO2 (g/km) - High - TEL133
WLTP - CO2 (g/km) - Low216WLTP - CO2 (g/km) - Low - TEH219
WLTP - CO2 (g/km) - Low - TEL212WLTP - CO2 (g/km) - Medium161
WLTP - CO2 (g/km) - Medium - TEH164WLTP - CO2 (g/km) - Medium - TEL156

Engine and Drive Train

CamshaftDOHCCatalytic ConvertorTrue
CC1998Compression Ratio11.0:1
Cylinder LayoutIN-LINECylinders4
Cylinders - Bore (mm)82Cylinders - Stroke (mm)94.6
Engine CodeB48B20M1Engine LayoutNORTH SOUTH
Number of Valves16TransmissionSEMI-AUTO

Fuel Consumption - ICE

WLTP - FC (l/100km) - Comb7WLTP - FC (l/100km) - Comb - TEH7.1
WLTP - FC (l/100km) - Comb - TEL6.8WLTP - FC (l/100km) - Extra High6.9
WLTP - FC (l/100km) - Extra High - TEH6.9WLTP - FC (l/100km) - Extra High - TEL6.6
WLTP - FC (l/100km) - High6.1WLTP - FC (l/100km) - High - TEH6.1
WLTP - FC (l/100km) - High - TEL5.8WLTP - FC (l/100km) - Low9.5
WLTP - FC (l/100km) - Low - TEH9.6WLTP - FC (l/100km) - Low - TEL9.3
WLTP - FC (l/100km) - Medium7.1WLTP - FC (l/100km) - Medium - TEH7.2
WLTP - FC (l/100km) - Medium - TEL6.9WLTP - MPG - Comb40.4
WLTP - MPG - Comb - TEH39.8WLTP - MPG - Comb - TEL41.5
WLTP - MPG - Extra High40.9WLTP - MPG - Extra High - TEH40.9
WLTP - MPG - Extra High - TEL42.8WLTP - MPG - High46.3
WLTP - MPG - High - TEH46.3WLTP - MPG - High - TEL48.7
WLTP - MPG - Low29.7WLTP - MPG - Low - TEH29.4
WLTP - MPG - Low - TEL30.4WLTP - MPG - Medium39.8
WLTP - MPG - Medium - TEH39.2WLTP - MPG - Medium - TEL40.9


Badge Engine CC2.0Badge Power184
Coin DescriptioniCoin SeriesM Sport [Pro pk]
Generation Mark2Insurance Group 1 - 50 Effective January 0733E
NCAP Adult Occupant Protection %96NCAP Child Occupant Protection %80
NCAP Overall Rating - Effective February 095NCAP Pedestrian Protection %93
NCAP Safety Assist %72Service Interval Frequency - Months24
Service Interval Mileage18000Standard manufacturers warranty - Mileage999999
Standard manufacturers warranty - Years3Vehicle Homologation ClassM1


0 to 62 mph (secs)8.2Engine Power - BHP184
Engine Power - KW135Engine Power - PSTrue
Engine Power - RPM5000Engine Torque - LBS.FT221
Engine Torque - MKG30.6Engine Torque - NM300
Engine Torque - RPM1350Top Speed147

Test Cycles

Emissions Test CycleWLTPRDE Certification LevelRDE 2


Alloys?TrueTyre Size Front225/40 R19
Tyre Size Rear255/35 R19Tyre Size SpareRUN FLAT TYRES
Wheel StyleDOUBLE SPOKE STYLE 797MWheel Type19" ALLOY

Vehicle Dimensions

Width (including mirrors)2081 

Weight and Capacities

Fuel Tank Capacity (Litres)59Gross Vehicle Weight2185
Luggage Capacity (Seats Up)385Max. Loading Weight495
Max. Towing Weight - Braked1600Max. Towing Weight - Unbraked750
Minimum Kerbweight1690No. of Seats4
Turning Circle - Kerb to Kerb11.4
The vehicle information above was correct at time of manufacture. Please speak to the dealership for full current specification.

Independent review

Review courtesy of Car and Driving

BMW 4 Series Convertible

BMW's second generation 4 Series Convertible has more appeal in this improved form. Jonathan Crouch takes a look.

Ten Second Review

The improved version of BMW's second generation 4 Series Convertible now has an even more distinctive look and a sporting dynamic feel. Inside, there's now more media tech and an even plusher cabin. The range has been severely slimmed down in this updated form, but for brand enthusiasts, there's still plenty to like. You won't get the large boot and cutting-edge driving dynamics of the 4 Series Coupe, but compensations come in the form of refinement, security and drop-top desirability. You'd like one.


Echoing the bold style of its 4 Series Coupe showroom stablemate, the improved version of BMW's second generation 4 Series Convertible aims to blend sporting driving pleasure and open-air thrills to continue the 40-year legacy in this model class that began with the Munich maker's first 3 Series Convertible. As before, it sizes up to the same two segment arch-rivals, Audi's A5 Convertible and what's now called the Mercedes CLE Cabriolet - and like those competitors uses a fabric roof. With this smarter revised model, plenty of changes under the skin aim to make it a bit more of a driver's car than before.

Driving Experience

BMW has worked hard to ensure that this 4 Series Convertible's handling is as close to that of the equivalent Coupe as possible, using extra bracing and special panels to improve body rigidity. As usual with this model range, there's rear wheel drive and xDrive 4WD for the fastest models. There are no dynamic or engineering changes for this updated model, but BMW has slimmed down the powerplant range considerably, discontinuing diesel power and dropping the previous mid-level 430i petrol variant. That leaves only two mainstream models; the base rear-driven 184hp 420i; and the six cylinder 374hp M440i, which only comes in xDrive 4WD form. That six cylinder engine also features in 530hp form in the flagship M4 Competition variant, also only offered in xDrive guise. As before, there are firm springs and anti-roll bars, plus this Coupe gets a double-jointed spring-strut front suspension and a 5-link rear axle. All the engines link up as standard with eight-speed Steptronic auto transmission, which incorporates Launch Control for Grand Prix-style getaways. As previously, the M440i gets a Sprint function that gives you a steering wheel paddle that when activated, gives you an extra burst of acceleration. Toupees will need to be very firmly tied down. Arguably, less is more here - it's the rear-driven 420i that gets closest to BMW's traditional mid-sized coupe driver's formula. Rivals have long tried to copy this variant's front engine, rear wheel drive BMW layout with its near perfect 50:50 weight distribution - but never quite managed to deliver a package with the same kind of involving finesse. Super-effective traction and stability systems keep those back wheels in check so that if you're not a driving enthusiast, it'll all feel quite normal. But if you are, then the feeling of being propelled up the road by the back wheels as you exit a bend rarely fails to offer up a great feeling of pleasure.

Design and Build

When this MK2 4 Series Convertible first arrived, we were all talking about its rather inevitable switch from the previous model's metal hard top roof to the same kind of folding fabric top that rivals Audi and Mercedes offer. That meant a 40% reduction in roof weight from a soft top that uses panel bow elements and a glass rear window for optimum acoustic and thermal comfort. The electric folding roof takes 18 seconds to open or close and can be used at speeds of up to 31mph. With the revised version of this MK2 model, BMW wants us to talk about the car's redesigned LED headlights, with their smarter illumiating signature. That once-controversial grille is now surrounded by matte chrome and there are restyled front and rear bumpers too. Customers can add in the 'laser' rear lighting units first seen on the rare M4 CSL, plus there are restyled 19-inch wheel designs. And the top M440i gets black exterior design elements and horizontal bars within the kidney grilles. The CLAR mixed steel-and-alloy platform that underpinned the previous version of this car is retained, but BMW has tried to reduce its weight through greater use of aluminium panels. Inside, the air vents have been redesigned, as has been the steering wheel, which is now flat-bottomed and has standard shift paddles for the auto gearbox. As before, the 'BMW Live Cockpit Professional' dash set-up is standard, offering a fully digital screen layout that gives you a high-resolution 12.3-inch instrument cluster behind the steering wheel and a 10.25-inch iDrive infotainment Central Control Display, which now runs the brand's latest OS 8.5 software system, which gives you more customisation options. There's also enhanced voice control for the climate functions. As before, this is billed as a 'proper four-seater', though the rear seat isn't as comfortable as in the Coupe. Predictably, there's not as much boot space either, the Coupe variant's 440-litre capacity figure falling to 385-litres with the roof closed and 300-litres with the top down.

Market and Model

Sporty 'M Sport' trim is standardised and prices start from around £50,000 for the entry-level 420i, which means a big price premium of almost £7,000 over the equivalent Coupe model. Think in terms of around £65,000 if you want the M440i xDrive model. The top M4 Competition Convertible M xDrive model is around £88,000. Equipment levels have been subtly upgraded. Ambvient lighting's now standard and upholstery comes in a new velour the brand calls 'M Performtex'. Optional is Sensatec perforated manmade leather - or real quilted Vernasca leather. Interior trim strips in Aluminium Rhombicle Anthracite are standard, whilst Fineline Light Brown open-pored and Grey Blue Ash open-pored fine-wood trim, and M interior trim carbon fibre are available as options. Customers can also now have the gear selector lever, iDrive Controller and Start/Stop button in a 'CraftedClarity cut-glass finish. A Personal eSIM comes as standard with the car, in addition to its built-in mobile SIM. This enables the vehicle to use the 5G mobile communications standard. The Personal eSIM allows the customer to use the communications and connectivity functions covered by their mobile contract from their car with ease - even in situations where they don't have their smartphone with them. This also includes data streaming via the WiFi hotspot. Wheel sizes vary between 18 and 20-inches and among the options are an M Performance front ornamental grille and M Performance side sill attachments, both in carbon fibre. Interior equipment highlights include the M Performance seat back pans in Alcantara/carbon fibre, the M Performance interior trim strips in carbon fibre and the M Performance door sill trims, also in carbon fibre.

Cost of Ownership

As before, mild hybrid technology is included with both the mainstream engines. Fitting a 48V starter-generator and second battery greatly increases the scope for utilising Brake Energy Regeneration and the electrical power it produces. The recuperated energy collected by the 48V battery can be supplied to the 12V electrical system or used for generating additional drive power when fed back to the 48V starter-generator. When the car is accelerating, the generator is also able to offer the driver an electric boost effect that instantly makes an extra 11hp available. All of which should promise a very competitive set of efficiency stats. Let's see. The 420i is rated at between 46.3 and 49.6mpg on the combined cycle and 140-131g/km of CO2; for the six cylinder M440i xDrive, it's 38.2-40.9mpg and 169-159g/km. For the M4 Competition xDrive Convertible, it's 27.7mpg and 231g/km. Residual values? Well we expect the depreciation on this facelifted second generation 4 Series Convertible to be pretty similar to that of its direct predecessor, which would mean a very competitive retained worth of about 45% after three years and 60,000 miles. On to the warranty package. BMW's warranty only lasts for three years but it includes an Emergency breakdown service and at least it isn't mileage limited - unlike the comparable package you'd get as standard with a rival Audi. You can of course extent the warranty with either monthly or annual payments. There's a three year paintwork warranty and the usual 12 year anti-corrosion warranty.


Like many of its owners will be, BMW is quietly satisfied with this 4 Series Convertible, especially in this revised form. Would this car be a more engaging driving machine without the extra weight of its roof mechanicals? The extra sharpness of its 4 Series Coupe stablemate certainly suggests that. I sense though, that most buyers of this open-topped version will be quite happy with a more relaxed, comfortable demeanour. That is, after all, as much as competitors from Audi and Mercedes offer - and those brands can't deliver the engine choice BMW provides here. In fact, a lot of boxes are ticked by this car if you can afford its asking price. You get impressive safety systems, high residual values, above average rear seat legroom and a sheer depth of engineering that rarely fails to impress. As a result, in many ways, it's probably the most complete contender in this segment and, best of all, it looks as striking and expensive as a convertible of this kind should when the sun's out and all is right with the world. True, there are probably all kinds of ways of more sensibly spending the budget required for one of these. You know what though? Right here, right now, I can't really think of any....


* Depending on the age of the vehicle, MPG and CO2 may be quoted using either NEDC or WLTP testing standards.  Find out more

Figures are provided for comparison purposes. Fuel consumption under real world driving conditions and the CO2 produced will depend upon a number of factors, including any accessories fitted after registration, variations in driving styles, weather conditions and vehicle load.

Personal contract purchase (PCP)

This is an example, we’ll always discuss your options in detail before you choose.

46 monthly payments of£599
Total amount payable£52,372
Fixed interest rate4%
Representative APR7.9%
Cash price£42,998
Credit amount£38,999
Contract mileage32,000
Excess mileage charge13.02p per mile
Optional final payment£20,220
Term (months)47

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This vehicle is available at BMW branches.