4BA-BB6A
Nissan Roox BB6A specs
BB6A is the model code of the Nissan Roox, a kei car. Japan’s transport ministry lists it in its fuel economy lists from 2026 under the model type 4BA-BB6A. A genuine car’s chassis number starts BB6A-.
BB6A at a glance
- Make
- Nissan
- Model
- Roox
- Model code
- BB6A
- Model types
- 4BA-BB6A
- In MLIT’s lists
- 2026
- Engines
- BR06 659 cc petrol
- Gearboxes
- CVT automatic
- Drive
- four-wheel drive
- Kerb weight
- 1,030–1,050 kg
- Official fuel economy
- 17.4 km/L (49 mpg)
Fuel economy is from Japan’s official tests and is usually better than you’ll see on UK roads. MLIT doesn’t list power or torque.
4BA-BB6A
Listed 2026. The 4BA prefix (our explanation, not MLIT’s) means petrol passenger car certified to Japan’s 2018 emissions rules, 25% below their limits. Check 4BA-BB6A against ULEZ and clean air zones.
| Engine | Gearbox | Drive | Weight | Seats | Fuel economy | Listed |
|---|---|---|---|---|---|---|
| BR06659 cc petrol | CVT automatic | four-wheel drive | 1,030–1,050 kg | 4 | 17.4 km/L49 mpg, WLTC test | 2026 |
Each row is one version as MLIT lists it. A version can appear twice when MLIT gave figures on two tests that year. Low-emission stars and trim names aren’t shown. MLIT gives fuel economy in km/L; the mpg figures are our conversion to UK gallons. Japanese tests are gentler than real UK driving, so expect less.
BB6A build year by chassis number
Japan’s carmakers list the chassis numbers each code was built with every year from 2015. Find the serial below, or use the build year finder.
| Built | Chassis numbers |
|---|---|
| 2025 | BB6A-000001 to 001833 |
From the JAMA chassis number lists: 車台番号一覧表. We keep only the chassis code, serial ranges and year. JAMA calls them reference information, not a certificate.
Check a BB6A before you buy
Make sure the car is what the advert says: the chassis number on the V5C should start BB6A-, and the engine and gearbox should match one of the versions above. Our free check reads the UK MOT history and compares it with the chassis code.
Other Nissan Roox model codes
Questions
What engine does the BB6A have?
MLIT lists the Nissan Roox BB6A with BR06 659 cc petrol.
What fuel economy does the BB6A get?
Officially 17.4 km/L (about 49 mpg), on Japan’s own tests. Real-world figures are usually lower, especially against the older 10-15 mode test.
How heavy is the BB6A?
Between 1,030 and 1,050 kg kerb weight, depending on the version.
Is 4BA-BB6A the same as BB6A?
Yes. 4BA-BB6A is the full model type: the letters before the hyphen are Japan’s emissions code, which changed as the rules were tightened, and BB6A is the model code. The chassis number starts with BB6A-.
About these figures
The model types, engine codes, capacities, gearboxes, drive, weights, seats and km/L figures are copied from MLIT’s yearly lists of cars on sale in Japan each March, so “listed” years are list years, not exact production dates. The English model names, mpg conversions, emissions code explanations and chassis number matching are ours. Lists before 2013 were printed as PDFs that we read by machine; where an older list gives an engine code that doesn’t match its capacity, we’ve used the figure the same model type has in other years. Check anything that matters against the car’s own papers. Spotted a mistake? Email [email protected]. All Nissan model codes.
Source: Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan, fuel economy lists 2004–2026, used under the Public Data License 1.0. Edited and translated by JDM History.