5AA-B37W
Mitsubishi eK B37W specs
B37W is the model code of the Mitsubishi eK, a kei car. Japan’s transport ministry lists it in its fuel economy lists from 2020–2026 under the model type 5AA-B37W. A genuine car’s chassis number starts B37W-.
B37W at a glance
- Make
- Mitsubishi
- Model
- eK
- Model code
- B37W
- Model types
- 5AA-B37W
- In MLIT’s lists
- 2020–2026
- Engines
- BR06-SM21 659 cc petrol
- Gearboxes
- CVT automatic
- Drive
- four-wheel drive
- Kerb weight
- 900–940 kg
- Official fuel economy
- 18.8–25.4 km/L (53–72 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-B37W
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-B37W against ULEZ and clean air zones.
| Engine | Gearbox | Drive | Weight | Seats | Fuel economy | Listed |
|---|---|---|---|---|---|---|
| BR06-SM21659 cc petrol | CVT automatic | four-wheel drive | 900–940 kg | 4 | 25–25.4 km/L71–72 mpg, Japanese JC08 test | 2020–2026 |
| BR06-SM21659 cc petrol | CVT automatic | four-wheel drive | 900–940 kg | 4 | 18.8–21.1 km/L53–60 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.
B37W 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 | B37W-000001 to 002303 |
| 2020 | B37W-002304 to 002625B37W-100001 to 100414 |
| 2021 | B37W-100415 to 101021B37W-200001 to 200283 |
| 2022 | B37W-200284 to 200689B37W-300001 to 300409 |
| 2023 | B37W-300410 to 300722B37W-400001 to 400306 |
| 2024 | B37W-400307 to 400494B37W-500001 to 500319 |
| 2025 | B37W-500320 to 500451B37W-600001 to 600317 |
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 B37W before you buy
Make sure the car is what the advert says: the chassis number on the V5C should start B37W-, 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 Mitsubishi eK model codes
Questions
What engine does the B37W have?
MLIT lists the Mitsubishi eK B37W with BR06-SM21 659 cc petrol.
What fuel economy does the B37W get?
Officially between 18.8 and 25.4 km/L (about 53–72 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 B37W?
Between 900 and 940 kg kerb weight, depending on the version.
Is 5AA-B37W the same as B37W?
Yes. 5AA-B37W is the full model type: the letters before the hyphen are Japan’s emissions code, which changed as the rules were tightened, and B37W is the model code. The chassis number starts with B37W-.
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 Mitsubishi 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.