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 8 MOT tests on record, passing 6 and failing 2 (75% pass rate). It has 63,635 miles on the clock, averaging 8,939 miles per year, around 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 HN18 SDV
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
About average| Latest reading | 63,635 miles |
| Reading date | |
| Miles last year | 4,405 |
| Average per year | 8,939 |
| Mileage consistency | Consistent |
Check HN18 SDV
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- Plate & colour change history
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- 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 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 | HN18 SDV |
| Make | Audi |
| Model | A3 |
| Colour | White |
| Fuel type | Petrol |
| Engine | 999cc |
| Year | 2018 |
| First registered | |
| Area code | HN — Portsmouth, Hampshire and Dorset |
| Age identifier | 18 — March 2018 to August 2018 |
More HN18 S plates
Browse all HN18 S registrations from Portsmouth.
About HN18 SDV
What car is HN18 SDV?
HN18 SDV is an white Audi A3, petrol (999cc). First registered in Portsmouth in 2018.
What is the mileage of HN18 SDV?
The last recorded mileage for HN18 SDV was 63,635 miles, recorded on 13 Jan 2026 during its most recent MOT test.
Has HN18 SDV passed its MOT?
HN18 SDV has had 8 MOT tests with a 75% pass rate (6 passes, 2 failures). It last passed on 13 Jan 2026.
Is HN18 SDV ULEZ compliant?
Based on its fuel type and registration year, HN18 SDV 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 HN18 SDV?
HN18 SDV is approximately 8 years old. Age identifier 18 means registered between 1 March 2018 and 31 August 2018.