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 Audi A3 Petrol 999cc has had 7 MOT tests on record, passing 6 and failing once (86% pass rate). It has 42,862 miles on the clock, averaging 4,594 miles per year, well below the UK average of 7,400. The 1.0 TFSI engine is known for 1. carbon buildup on intake valves and 2. turbocharger actuator/wastegate linkage failure.
MOT & Mileage History for KW18 CNX
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
Low mileage| Latest reading | 42,862 miles |
| Reading date | |
| Miles last year | 2,033 |
| Average per year | 4,594 |
| Mileage consistency | Variable |
Check KW18 CNX
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Full MOT Test History 7 tests on record
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Reported issues for this Audi A3
These are the most commonly reported problems on Audi A3 models (2012–2020), based on owner reports and workshop data across the UK.
1. Carbon Buildup on Intake Valves
Direct-injection petrol engines like the CHZB lack fuel spray across the intake valves during the induction stroke. Without this natural cleaning action, carbon deposits accumulate on the valve stems and seats, restricting airflow.[2]
2. Turbocharger Actuator/Wastegate Linkage Failure
The actuator linkage connecting the wastegate solenoid to the wastegate valve becomes faulty or loose, causing loss of boost control. Many repair shops misdiagnose this as full turbocharger failure and recommend a costly replacement (€1,000+) when only the actuator arm needs repair (€150).[3]
Common faults, what to check, and what to pay
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Vehicle Details
| Registration | KW18 CNX |
| Make | Audi |
| Model | A3 |
| Colour | Blue |
| Fuel type | Petrol |
| Engine | 999cc |
| Year | 2018 |
| First registered | |
| Area code | KW — Luton, Luton and Northampton |
| Age identifier | 18 — March 2018 to August 2018 |
More KW18 C plates
Browse all KW18 C registrations from Luton.
About KW18 CNX
What car is KW18 CNX?
KW18 CNX is a blue Audi A3, petrol (999cc). First registered in Luton in 2018.
What is the mileage of KW18 CNX?
The last recorded mileage for KW18 CNX was 42,862 miles, recorded on 21 Apr 2026 during its most recent MOT test.
Has KW18 CNX passed its MOT?
KW18 CNX has had 7 MOT tests with an 86% pass rate (6 passes, 1 failure). It last passed on 21 Apr 2026.
Is KW18 CNX ULEZ compliant?
Based on its fuel type and registration year, KW18 CNX 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 KW18 CNX?
KW18 CNX is approximately 8 years old. Age identifier 18 means registered between 1 March 2018 and 31 August 2018.