DBA-B21A
Nissan Dayz Roox B21A specs
B21A is the model code of the Nissan Dayz Roox, a kei car. Japan’s transport ministry lists it in its fuel economy lists from 2015–2020 under the model type DBA-B21A. A genuine car’s chassis number starts B21A-.
B21A at a glance
- Make
- Nissan
- Model
- Dayz Roox
- Model code
- B21A
- Model types
- DBA-B21A
- In MLIT’s lists
- 2015–2020
- Engines
- 3B20 659 cc petrol
- Gearboxes
- CVT automatic
- Drive
- four-wheel drive, front-wheel drive
- Kerb weight
- 920–1,010 kg
- Official fuel economy
- 18.2–22.2 km/L (51–63 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.
DBA-B21A
Listed 2015–2020. The DBA prefix (our explanation, not MLIT’s) means petrol passenger car certified to Japan’s 2005 emissions rules, 75% below their limits. Check DBA-B21A against ULEZ and clean air zones.
| Engine | Gearbox | Drive | Weight | Seats | Fuel economy | Listed |
|---|---|---|---|---|---|---|
| 3B20659 cc petrol | CVT automatic | four-wheel drive | 970–1,010 kg | 4 | 18.2–21.8 km/L51–62 mpg, Japanese JC08 test | 2015–2020 |
| 3B20659 cc petrol | CVT automatic | front-wheel drive | 920–960 kg | 4 | 20.6–22.2 km/L58–63 mpg, Japanese JC08 test | 2015–2020 |
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.
B21A 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 |
|---|---|
| 2015 | B21A-093839 to 121455B21A-170001 to 221585 |
| 2016 | B21A-221586 to 262110B21A-300001 to 309881 |
| 2017 | B21A-309882 to 384268 |
| 2018 | B21A-384269 to 408142B21A-500001 to 552940 |
| 2019 | B21A-552941 to 626813 |
| 2020 | B21A-626814 to 628318 |
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 B21A before you buy
Make sure the car is what the advert says: the chassis number on the V5C should start B21A-, 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.
Questions
What engine does the B21A have?
MLIT lists the Nissan Dayz Roox B21A with 3B20 659 cc petrol.
What fuel economy does the B21A get?
Officially between 18.2 and 22.2 km/L (about 51–63 mpg), depending on the version, on Japan’s own tests. Real-world figures are usually lower, especially against the older 10-15 mode test.
How heavy is the B21A?
Between 920 and 1,010 kg kerb weight, depending on the version.
Is DBA-B21A the same as B21A?
Yes. DBA-B21A is the full model type: the letters before the hyphen are Japan’s emissions code, which changed as the rules were tightened, and B21A is the model code. The chassis number starts with B21A-.
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.