4AA-B45A
Nissan Roox B45A specs
B45A is the model code of the Nissan Roox, a kei car. Japan’s transport ministry lists it in its fuel economy lists from 2021–2026 under the model type 4AA-B45A. A genuine car’s chassis number starts B45A-.
B45A at a glance
- Make
- Nissan
- Model
- Roox
- Model code
- B45A
- Model types
- 4AA-B45A
- In MLIT’s lists
- 2021–2026
- Engines
- BR06-SM21 659 cc petrol
- Gearboxes
- CVT automatic
- Drive
- front-wheel drive
- Kerb weight
- 960–1,010 kg
- Official fuel economy
- 18.8–23.8 km/L (53–67 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.
4AA-B45A
Listed 2021–2026. The 4AA prefix (our explanation, not MLIT’s) means hybrid passenger car certified to Japan’s 2018 emissions rules, 25% below their limits. Check 4AA-B45A against ULEZ and clean air zones.
| Engine | Gearbox | Drive | Weight | Seats | Fuel economy | Listed |
|---|---|---|---|---|---|---|
| BR06-SM21659 cc petrol | CVT automatic | front-wheel drive | 960–1,010 kg | 4 | 22.4–23.8 km/L63–67 mpg, Japanese JC08 test | 2021–2026 |
| BR06-SM21659 cc petrol | CVT automatic | front-wheel drive | 960–1,010 kg | 4 | 18.8–19.2 km/L53–54 mpg, WLTC test | 2021–2026 |
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.
B45A 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 |
|---|---|
| 2020 | B45A-000001 to 318989 |
| 2021 | B45A-318990 to 337205 |
| 2022 | B45A-337206 to 346714B45A-400001 to 407303 |
| 2023 | B45A-407304 to 413364B45A-500001 to 512070 |
| 2024 | B45A-512071 to 518408B45A-600001 to 610901 |
| 2025 | B45A-610902 to 621911 |
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 B45A before you buy
Make sure the car is what the advert says: the chassis number on the V5C should start B45A-, 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 B45A have?
MLIT lists the Nissan Roox B45A with BR06-SM21 659 cc petrol.
What fuel economy does the B45A get?
Officially between 18.8 and 23.8 km/L (about 53–67 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 B45A?
Between 960 and 1,010 kg kerb weight, depending on the version.
Is 4AA-B45A the same as B45A?
Yes. 4AA-B45A is the full model type: the letters before the hyphen are Japan’s emissions code, which changed as the rules were tightened, and B45A is the model code. The chassis number starts with B45A-.
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.