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 2020 Seat Leon Diesel 1598cc has had 5 MOT tests on record, passing 4 and failing once (80% pass rate). It has 144,849 miles on the clock, averaging 21,589 miles per year, above the UK average of 7,400. The 1.6 TDI engine is known for clha and diesel particulate filter (dpf).
MOT & Mileage History for KN20 AEJ
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
Above average| Latest reading | 144,849 miles |
| Reading date | |
| Miles last year | 8,256 |
| Average per year | 21,589 |
| Mileage consistency | Variable |
Check KN20 AEJ
- 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 5 tests on record
Similar cars to consider
Buyers comparing the Seat Leon often also look at these models. Check their MOT history and reliability before deciding:
Reported issues for this Seat Leon
These are the most commonly reported problems on Seat Leon models (2012–2020), based on owner reports and workshop data across the UK.
CLHA
Diesel Particulate Filter (DPF)
Clogs from poor fuel quality, short journeys, or failed regens, leading to backpressure.
Explore more about the Seat Leon
Thinking about buying this car? These resources will help you make an informed decision.
Vehicle Details
| Registration | KN20 AEJ |
| Make | Seat |
| Model | Leon |
| Colour | White |
| Fuel type | Diesel |
| Engine | 1598cc |
| Year | 2020 |
| First registered | |
| Area code | KN — Luton, Luton and Northampton |
| Age identifier | 20 — March 2020 to August 2020 |
More KN20 A plates
Browse all KN20 A registrations from Luton.
About KN20 AEJ
What car is KN20 AEJ?
KN20 AEJ is a white Seat Leon, diesel (1598cc). First registered in Luton in 2020.
What is the mileage of KN20 AEJ?
The last recorded mileage for KN20 AEJ was 144,849 miles, recorded on 3 Apr 2026 during its most recent MOT test.
Has KN20 AEJ passed its MOT?
KN20 AEJ has had 5 MOT tests with an 80% pass rate (4 passes, 1 failure). It last passed on 3 Apr 2026.
Is KN20 AEJ ULEZ compliant?
Based on its fuel type and registration year, KN20 AEJ is likely ULEZ compliant. Diesel post-2015 (Euro 6). This is an estimate based on typical emission standards — confirm with TfL's ULEZ checker for a definitive answer.
How old is KN20 AEJ?
KN20 AEJ is approximately 6 years old. Age identifier 20 means registered between 1 March 2020 and 31 August 2020.