- With standard equipment
- With safety pack
Find more information in the General Comments section of the assessment
Find more information in the Rating Validity tab of the assessment
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96% -
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80% -
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93% -
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72%
- Good
- Adequate
- Marginal
- Weak
- Poor
Passenger
Driver
Rear Passenger
Driver
Car
Pole
Rear Seat
Front Seat
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Approaching a stationary car: Left Offset
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Approaching a stationary car: No Offset
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Approaching a stationary car: Right Offset
- Good
- Adequate
- Marginal
- Weak
- Poor
Passenger
outboard
center
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Fitted to the vehicle as standard![]()
Not fitted to the test vehicle but available as option![]()
Not Available
Not fitted to the test vehicle but available as option-
i-Size CRS
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ISOFIX CRS
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Universal Belted CRS
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Easy![]()
Difficult![]()
Safety critical![]()
Not allowed
| Seat Position | |||
|---|---|---|---|
| Front | 2nd row | ||
| Passenger | Left | Right | |
| Maxi Cosi 2way Pearl & 2wayFix (rearward) (iSize) |  |
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| Maxi Cosi 2way Pearl & 2wayFix (forward) (iSize) | |
 |
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| BeSafe iZi Kid X2 i-Size (iSize) | |
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| BeSafe iZi Flex FIX i-Size (iSize) | |
|
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| Maxi Cosi Cabriofix & FamilyFix (ISOFIX) | |
|
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| BeSafe iZi Kid X4 ISOfix (ISOFIX) | |
|
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| Britax Römer Duo Plus (ISOFIX) | |
|
|
| Britax Römer KidFix XP (ISOFIX) | |
|
|
| Maxi Cosi Cabriofix (Belt) | |
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| Maxi Cosi Cabriofix & EasyBase2 (Belt) | |
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| Britax Römer King II LS (Belt) | |
 |
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| Britax Römer KidFix XP (Belt) | |
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Easy![]()
Difficult![]()
Safety critical![]()
Not allowed
In the frontal offset and side barrier crash tests, protection of both the 6- and 10-year dummies was good or adequate for all critical parts of the body. The front passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position. Clear information is provided to the driver regarding the status of the airbag, and the system was rewarded. Some child restraint systems could not be properly installed in the car owing to the shape of the rear seats but most could be properly fitted and accommodated.
- Good
- Adequate
- Marginal
- Weak
- Poor
Head Impact 22.3 Pts
Pelvis Impact 6.0 Pts
Leg Impact 6.0 Pts
| System Name | Person Warning with City Braking Function | ||
| Type | Auto-Brake with Forward Collision Warning | ||
| Operational From | 5 km/h | ||
| PERFORMANCE | | |||
- Day time
- Night time
Day time
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Adult crossing the road
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Child running from behind parked vehicles
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Adult along the roadside
Night time
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Adult crossing the road
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Adult along the roadside
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Approaching a crossing cyclist
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Cyclist along the roadside
The 4-series convertible has an 'active' bonnet. Sensors in the bumper detect when a pedestrian has been struck and actuators lift the bonnet to provide greater clearance to the stiff structures in the engine compartment. BMW showed that the system performed robustly for a variety of pedestrian statures and over a wide range of speeds. Accordingly, the bonnet was tested in its deployed, raised position and protection over its surface was almost entirely good, poor results being recorded only along the base of the windscreen and on the stiff windscreen pillars. The bumper provided good protection to pedestrians' legs at all test points. Protection of the pelvis was mixed also good in all of Euro NCAP’s tests. The AEB system can detect pedestrians and cyclists as well as other cars. In tests of its response to such vulnerable road users, the system performed well, with collisions avoided or mitigated in all test scenarios.
- Good
- Adequate
- Marginal
- Weak
- Poor
| System Name | Speed Limit Assist |
| Speed Limit Information Function | Camera based |
| Speed Control Function | System advised (accurate to 5km/h) |
| Applies To | All Seats | ||
| Warning | Driver Seat | Front Passenger(s) | Rear Passenger(s) |
| Visual | |
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| Audible | |
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| Occupant Detection | |
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|||
| System Name | Lane Departure Warning |
| Type | LKA (including LDW) |
| Operational From | 70 km/h |
| Performance | |
| Lane Keep Assist | |
| Human Machine Interface | |
| System Name | Front-End Collision Warning with Braking Function | |||
| Type | Autonomous Emergency Braking and Forward Collision Warning | |||
| Operational From | 5 km/h | |||
| Additional Information | Supplementary warning | |||
- Autobrake function only
- Driver reacts to warning
Autobrake function only
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Approaching a slower moving car
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Approaching a slower moving car
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Approaching a slower moving car
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Approaching a braking car
Driver reacts to warning
-
Approaching a stationary car
-
Approaching a stationary car
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Approaching a stationary car
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Approaching a slower moving car
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Approaching a slower moving car
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Approaching a slower moving car
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Approaching a braking car
The 4-series convertible has a seatbelt reminder as standard equipment for the front and rear seats. Lane support helps prevent inadvertent drifting out of lane by warning the driver and gently correcting the vehicle's path. The standard-fit speed assistance system uses a camera to determine the prevailing speed limit and presents this information to the driver, allowing the limiter to be set appropriately. The AEB system performed well in tests of its response to other cars at highway speeds, with collisions avoided or mitigated in all test scenarios.
- Specifications
- Safety Equipment
- Videos
- Rating Validity
Specifications
Tested Model BMW 420d, LHD
Body Type - 2 door cabriolet
Year Of Publication 2019
Kerb Weight 1530kg
VIN From Which Rating Applies - all 4 Series convertibles
Class Large Family Car
Safety Equipment
Note: Other equipment may be available on the vehicle but was not considered in the test year.
![]()
Fitted to the vehicle as standard![]()
Fitted to the vehicle as part of the safety pack![]()
Not fitted to the test vehicle but available as option or as part of the safety pack![]()
Not available![]()
Not applicable
Fitted to the vehicle as part of the safety packVideos
Rating Validity
Find more information in the General Comments section of the assessment
The BMW 4 series convertible is structurally similar to the BMW 3 series tested in 2019 and shares the same level of safety equipment. Additional tests have been done where the performance of the cars might differ but, otherwise, test results are taken from the 3 series.
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The passenger compartment remained stable in the frontal offset test. Dummy readings indicated good protection of the knees and femurs of both the driver and passenger. BMW showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions. In the full-width rigid barrier test, protection of the driver and rear passenger was good or adequate for all critical body areas. The car scored maximum points in the side barrier test, with good protection of all critical body areas. In the more severe pole impact, protection of the chest was adequate and that of other critical body areas was good. Tests on the front seats and head restraints demonstrated good protection against whiplash injuries in the event of a rear-end collision. A geometric assessment of the rear seats also indicated good whiplash protection. The standard-fit autonomous emergency braking (AEB) system scored maximum points in tests of its functionality at low, city-driving speeds, with collisions avoided in all test scenarios.