Vehicle summary
ULEZ status is estimated based on fuel type and registration year. It may not reflect the actual emission standard of this vehicle. Check with TfL for a definitive answer.
At a glance
This 2021 Mini Cooper Petrol 1499cc has had 4 MOT tests on record, passing 3 and failing once (75% pass rate). It has 33,307 miles on the clock, averaging 6,265 miles per year, below the UK average of 7,400. The 1.5 B38 TwinPower Turbo engine is known for b38a15a and timing chain and guides.
MOT & Mileage History for KB21 SJB
Data from DVSA. Last updated August 2026. Check gov.uk for the latest.
MOT failure recorded
Average miles/year
Gaps in MOT history
Mileage Analysis
Below average| Latest reading | 33,307 miles |
| Reading date | |
| Average per year | 6,265 |
| Mileage consistency | Consistent |
Check KB21 SJB
- Write-off & insurance claims Experian
- Outstanding finance check Experian
- Stolen vehicle check Experian
- Ownership changes Experian
- Mileage discrepancy alerts
- Plate & colour change history
- Franchised dealer records
- Independent garage visits
- Service interval analysis
- Warranty work logged
Full MOT Test History 4 tests on record
Similar cars to consider
Buyers comparing the Mini Cooper often also look at these models. Check their MOT history and reliability before deciding:
Reported issues for this Mini Cooper
These are the most commonly reported problems on Mini Cooper models (2014–2023), based on owner reports and workshop data across the UK.
B38A15A
Timing Chain and Guides
Chain stretches prematurely; guides can break.
Common faults, what to check, and what to pay
Explore more about the Mini Cooper
Thinking about buying this car? These resources will help you make an informed decision.
Vehicle Details
| Registration | KB21 SJB |
| Make | Mini |
| Model | Cooper |
| Colour | Grey |
| Fuel type | Petrol |
| Engine | 1499cc |
| Year | 2021 |
| First registered | |
| Area code | KB — Northampton, Luton and Northampton |
| Age identifier | 21 — March 2021 to August 2021 |
More KB21 S plates
Browse all KB21 S registrations from Northampton.
About KB21 SJB
What car is KB21 SJB?
KB21 SJB is a grey Mini Cooper, petrol (1499cc). First registered in Northampton in 2021.
What is the mileage of KB21 SJB?
The last recorded mileage for KB21 SJB was 33,307 miles, recorded on 17 Jul 2026 during its most recent MOT test.
Has KB21 SJB passed its MOT?
KB21 SJB has had 4 MOT tests with a 75% pass rate (3 passes, 1 failure). It last passed on 17 Jul 2026.
Is KB21 SJB ULEZ compliant?
Based on its fuel type and registration year, KB21 SJB is likely ULEZ compliant. Petrol post-2005 (Euro 4). This is an estimate based on typical emission standards — confirm with TfL's ULEZ checker for a definitive answer.
How old is KB21 SJB?
KB21 SJB is approximately 5 years old. Age identifier 21 means registered between 1 March 2021 and 31 August 2021.