A 3S centre is a car dealership that handles three things for one brand in one place: Sales, Service and Spare parts. You buy the car, bring it back for servicing and get genuine parts from the same team, so the people who sold you the car are the ones who look after it.

Why it matters more for an electric car
An EV has a high-voltage battery, an electric motor and software that a general workshop may not be set up for. A brand 3S centre is where the brand's own diagnostic tools and parts supply are meant to be, which makes routine checks and warranty matters simpler.
3S, 4S: what is the difference?
A 4S centre adds a fourth S, usually Survey (customer feedback). In practice, what you want to know is simple: can you buy, service and get parts for your car at the same address? At a 3S centre the answer is yes.
Dongfeng's 3S centre in Johor
Our showroom at No. 28, Jalan Ekoperniagaan 3/11, Taman Ekoperniagaan, 81100 Johor Bahru is Johor's Dongfeng 3S centre for passenger EVs: the Dongfeng Vigo and Dongfeng 007. WhatsApp us to book a test drive or a service visit.
Questions
Does 3S mean the centre also repairs the car?
Yes, the second S is Service, which covers servicing and repairs for the brand's cars. Ask the centre which jobs it handles on site.