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 4 MOT tests on record, passing 3 and failing once (75% pass rate). It has 75,738 miles on the clock, averaging 14,064 miles per year, above 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 DE21 YSO
Data from DVSA. Last updated August 2026. Check gov.uk for the latest.
MOT failure recorded
Average miles/year
Gap in MOT history
Mileage Analysis
Above average| Latest reading | 75,738 miles |
| Reading date | |
| Miles last year | 18,137 |
| Average per year | 14,064 |
| Mileage consistency | Consistent |
Check DE21 YSO
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- Warranty work logged
Full MOT Test History 4 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 | DE21 YSO |
| Make | Bmw |
| Model | 3 Series |
| Colour | Blue |
| Fuel type | Petrol |
| Engine | 1998cc |
| Year | 2021 |
| First registered | |
| Area code | DE — Chester, Deeside to Shrewsbury |
| Age identifier | 21 — March 2021 to August 2021 |
More DE21 Y plates
Browse all DE21 Y registrations from Chester.
About DE21 YSO
What car is DE21 YSO?
DE21 YSO is a blue Bmw 3 Series, petrol (1998cc). First registered in Chester in 2021.
What is the mileage of DE21 YSO?
The last recorded mileage for DE21 YSO was 75,738 miles, recorded on 29 Jun 2026 during its most recent MOT test.
Has DE21 YSO passed its MOT?
DE21 YSO has had 4 MOT tests with a 75% pass rate (3 passes, 1 failure). It last passed on 29 Jun 2026.
Is DE21 YSO ULEZ compliant?
Based on its fuel type and registration year, DE21 YSO 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 DE21 YSO?
DE21 YSO is approximately 5 years old. Age identifier 21 means registered between 1 March 2021 and 31 August 2021.