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 Bmw 3 Series Petrol 1998cc has had 3 MOT tests on record, passing every one. It has 46,689 miles on the clock, averaging 8,827 miles per year, around the UK average of 7,400. The 320i engine is known for 1. coolant system failures (multiple components) and 2. valve cover gasket leaks.
MOT & Mileage History for HN21 KUW
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
About average| Latest reading | 46,689 miles |
| Reading date | |
| Miles last year | 8,906 |
| Average per year | 8,827 |
| Mileage consistency | Consistent |
Check HN21 KUW
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- Plate & colour change history
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- Independent garage visits
- Service interval analysis
- Warranty work logged
Full MOT Test History 3 tests on record
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Reported issues for this Bmw 3 Series
These are the most commonly reported problems on Bmw 3 Series models (2019–2024), based on owner reports and workshop data across the UK.
1. Coolant System Failures (Multiple Components)
The B48 uses a **mechanical water pump with a plastic impeller prone to cracking**, leading to reduced coolant circulation. The **thermostat housing is also plastic and prone to cracking from heat stress**. Hoses become brittle, radiators leak, and the turbo coolant return line develops leaks. These failures cascade—if the engine can't cool itself, oil and turbo temperatures rise, accelerating other failures.[1][2]
2. Valve Cover Gasket Leaks
The valve cover gasket deteriorates and begins to weep oil, typically as a result of heat cycling and age rather than a design flaw.[1][2]
Common faults, what to check, and what to pay
Explore more about the Bmw 3 Series
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Vehicle Details
| Registration | HN21 KUW |
| Make | Bmw |
| Model | 3 Series |
| Colour | White |
| Fuel type | Petrol |
| Engine | 1998cc |
| Year | 2021 |
| First registered | |
| Area code | HN — Portsmouth, Hampshire and Dorset |
| Age identifier | 21 — March 2021 to August 2021 |
More HN21 K plates
Browse all HN21 K registrations from Portsmouth.
About HN21 KUW
What car is HN21 KUW?
HN21 KUW is an white Bmw 3 Series, petrol (1998cc). First registered in Portsmouth in 2021.
What is the mileage of HN21 KUW?
The last recorded mileage for HN21 KUW was 46,689 miles, recorded on 22 Jul 2026 during its most recent MOT test.
Has HN21 KUW passed its MOT?
HN21 KUW has had 3 MOT tests with an 100% pass rate (3 passes, 0 failures). It last passed on 22 Jul 2026.
Is HN21 KUW ULEZ compliant?
Based on its fuel type and registration year, HN21 KUW 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 HN21 KUW?
HN21 KUW is approximately 5 years old. Age identifier 21 means registered between 1 March 2021 and 31 August 2021.