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 Mazda 3 Petrol 1998cc has had 2 MOT tests on record, passing every one. It has 22,785 miles on the clock, averaging 4,183 miles per year, well below the UK average of 7,400.
MOT & Mileage History for SN21 HDD
Data from DVSA. Last updated August 2026. Check gov.uk for the latest.
MOT failures recorded
Average miles/year
Gaps in MOT history
Mileage Analysis
Low mileage| Latest reading | 22,785 miles |
| Reading date | |
| Miles last year | 4,069 |
| Average per year | 4,183 |
| Mileage consistency | Consistent |
Check SN21 HDD
- 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 2 tests on record
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Vehicle Details
| Registration | SN21 HDD |
| Make | Mazda |
| Model | 3 |
| Colour | White |
| Fuel type | Petrol |
| Engine | 1998cc |
| Year | 2021 |
| First registered | |
| Area code | SN — Edinburgh, Scotland |
| Age identifier | 21 — March 2021 to August 2021 |
More SN21 H plates
Browse all SN21 H registrations from Edinburgh.
About SN21 HDD
What car is SN21 HDD?
SN21 HDD is an white Mazda 3, petrol (1998cc). First registered in Edinburgh in 2021.
What is the mileage of SN21 HDD?
The last recorded mileage for SN21 HDD was 22,785 miles, recorded on 8 Jul 2025 during its most recent MOT test.
Has SN21 HDD passed its MOT?
SN21 HDD has had 2 MOT tests with an 100% pass rate (2 passes, 0 failures). It last passed on 8 Jul 2025.
Is SN21 HDD ULEZ compliant?
Based on its fuel type and registration year, SN21 HDD 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 SN21 HDD?
SN21 HDD is approximately 5 years old. Age identifier 21 means registered between 1 March 2021 and 31 August 2021.