5AA-B44W
Nissan Dayz B44W specs
B44W is the model code of the Nissan Dayz, a kei car. Japan’s transport ministry lists it in its fuel economy lists from 2020–2026 under the model type 5AA-B44W. A genuine car’s chassis number starts B44W-.
B44W at a glance
- Make
- Nissan
- Model
- Dayz
- Model code
- B44W
- Model types
- 5AA-B44W
- In MLIT’s lists
- 2020–2026
- Engines
- BR06-SM21 659 cc petrol
- Gearboxes
- CVT automatic
- Drive
- front-wheel drive
- Kerb weight
- 840–870 kg
- Official fuel economy
- 21–29.8 km/L (59–84 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.
5AA-B44W
Listed 2020–2026. The 5AA prefix (our explanation, not MLIT’s) means hybrid passenger car certified to Japan’s 2018 emissions rules, 50% below their limits. Check 5AA-B44W against ULEZ and clean air zones.
| Engine | Gearbox | Drive | Weight | Seats | Fuel economy | Listed |
|---|---|---|---|---|---|---|
| BR06-SM21659 cc petrol | CVT automatic | front-wheel drive | 840–870 kg | 4 | 28–29.8 km/L79–84 mpg, Japanese JC08 test | 2020–2026 |
| BR06-SM21659 cc petrol | CVT automatic | front-wheel drive | 840–870 kg | 4 | 21–23.3 km/L59–66 mpg, WLTC test | 2020–2026 |
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.
B44W 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 |
|---|---|
| 2019 | B44W-000001 to 028925 |
| 2020 | B44W-028926 to 041811B44W-100001 to 109239 |
| 2021 | B44W-109240 to 122221 |
| 2022 | B44W-122222 to 131300B44W-300001 to 302994 |
| 2023 | B44W-302995 to 309688B44W-400001 to 403151 |
| 2024 | B44W-403152 to 410673B44W-500001 to 507561 |
| 2025 | B44W-507562 to 514233B44W-600001 to 606930 |
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 B44W before you buy
Make sure the car is what the advert says: the chassis number on the V5C should start B44W-, 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 Dayz model codes
Questions
What engine does the B44W have?
MLIT lists the Nissan Dayz B44W with BR06-SM21 659 cc petrol.
What fuel economy does the B44W get?
Officially between 21 and 29.8 km/L (about 59–84 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 B44W?
Between 840 and 870 kg kerb weight, depending on the version.
Is 5AA-B44W the same as B44W?
Yes. 5AA-B44W is the full model type: the letters before the hyphen are Japan’s emissions code, which changed as the rules were tightened, and B44W is the model code. The chassis number starts with B44W-.
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.