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 2018 Seat Leon Diesel 1598cc has had 6 MOT tests on record, passing every one. It has 51,441 miles on the clock, averaging 3,707 miles per year, well below the UK average of 7,400. The 1.6 TDI engine is known for clha and diesel particulate filter (dpf).
MOT & Mileage History for KJ18 UBX
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 | 51,441 miles |
| Reading date | |
| Miles last year | 3,521 |
| Average per year | 3,707 |
| Mileage consistency | Consistent |
Check KJ18 UBX
- 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 6 tests on record
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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 | KJ18 UBX |
| Make | Seat |
| Model | Leon |
| Colour | Grey |
| Fuel type | Diesel |
| Engine | 1598cc |
| Year | 2018 |
| First registered | |
| Area code | KJ — Northampton, Luton and Northampton |
| Age identifier | 18 — March 2018 to August 2018 |
More KJ18 U plates
Browse all KJ18 U registrations from Northampton.
About KJ18 UBX
What car is KJ18 UBX?
KJ18 UBX is a grey Seat Leon, diesel (1598cc). First registered in Northampton in 2018.
What is the mileage of KJ18 UBX?
The last recorded mileage for KJ18 UBX was 51,441 miles, recorded on 17 Jan 2026 during its most recent MOT test.
Has KJ18 UBX passed its MOT?
KJ18 UBX has had 6 MOT tests with an 100% pass rate (6 passes, 0 failures). It last passed on 17 Jan 2026.
Is KJ18 UBX ULEZ compliant?
Based on its fuel type and registration year, KJ18 UBX 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 KJ18 UBX?
KJ18 UBX is approximately 8 years old. Age identifier 18 means registered between 1 March 2018 and 31 August 2018.