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 2017 Seat Leon Petrol 1798cc has had 8 MOT tests on record, passing 7 and failing once (88% pass rate). It has 130,584 miles on the clock, averaging 14,673 miles per year, above the UK average of 7,400. The 1.8 TSI engine is known for cjsa and piston rings.
MOT & Mileage History for KS66 ONJ
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 | 130,584 miles |
| Reading date | |
| Miles last year | 14,205 |
| Average per year | 14,673 |
| Mileage consistency | Consistent |
Check KS66 ONJ
- Write-off & insurance claims Experian
- Outstanding finance check Experian
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- Plate & colour change history
- Franchised dealer records
- Independent garage visits
- Service interval analysis
- Warranty work logged
Full MOT Test History 8 tests on record
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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.
CJSA
Piston rings (faulty design leading to excessive oil consumption)
Premature wear on thin piston rings causes high oil burn-off, often 1 quart per 1,000-2,000 miles.[1][6]
Explore more about the Seat Leon
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Vehicle Details
| Registration | KS66 ONJ |
| Make | Seat |
| Model | Leon |
| Colour | Black |
| Fuel type | Petrol |
| Engine | 1798cc |
| Year | 2017 |
| First registered | |
| Area code | KS — Luton, Luton and Northampton |
| Age identifier | 66 — September 2016 to February 2017 |
More KS66 O plates
Browse all KS66 O registrations from Luton.
About KS66 ONJ
What car is KS66 ONJ?
KS66 ONJ is a black Seat Leon, petrol (1798cc). First registered in Luton in 2017.
What is the mileage of KS66 ONJ?
The last recorded mileage for KS66 ONJ was 130,584 miles, recorded on 8 Dec 2025 during its most recent MOT test.
Has KS66 ONJ passed its MOT?
KS66 ONJ has had 8 MOT tests with an 88% pass rate (7 passes, 1 failure). It last passed on 8 Dec 2025.
Is KS66 ONJ ULEZ compliant?
Based on its fuel type and registration year, KS66 ONJ 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 KS66 ONJ?
KS66 ONJ is approximately 9 years old. Age identifier 66 means registered between 1 September 2016 and 28 February 2017.