The DS No. 4 (stylized as DS Nð4, pronounced as "number 4" and previously known as the DS 4) was unveiled on 3 February 2021. It is intended to replace the DS 4 which was discontinued in 2018. It is based on the PSA EMP2 platform of the PSA Group. The car is available in three versions: Nð4 E-TENSE (100% electric), Nð4 HYBRID, Nð4 PLUG-IN-HYBRID.
Following the 2025 facelift it was renamed to the DS Nð4.
It was designed in Paris, but is produced at Opel's plant in Rüsselsheim.
In terms of powertrains, a E-TENSE hybrid version will be available, and in terms of petrol engines, it is equipped with the PureTech range with powers outputs of , , or . It is available for sale from the fourth quarter of 2021.
In October 2022, the trim structure was revised, which now includes a new Opera flagship and increased EV range for the E-Tense PHEV version.
Introduced in March 2023, the "Esprit de Voyage" special edition, French for "spirit of travel", is the flagship trim level for the DS 4 and DS 7 and features new materials and colour combinations inspired by the fashion industry.
The 2025 refresh for the DS 4 was announced on May 14, 2025. It features new body styling as well as a new front end inspired by the DS Nð8. The model was also renamed to the DS Nð4. Some changes were also made to the interior.
Most powertrain options are carried over from the original DS 4 with the exception of the diesel engine, which was discontinued.