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 every one. It has 69,683 miles on the clock, averaging 6,559 miles per year, 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 CH18 OEM
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
Below average| Latest reading | 69,683 miles |
| Reading date | |
| Miles last year | 10,242 |
| Average per year | 6,559 |
| Mileage consistency | Variable |
Check CH18 OEM
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- Service interval analysis
- Warranty work logged
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 | CH18 OEM |
| Make | Audi |
| Model | A3 |
| Colour | Black |
| Fuel type | Petrol |
| Engine | 999cc |
| Year | 2018 |
| First registered | |
| Area code | CH — Cardiff, Cymru (Wales) |
| Age identifier | 18 — March 2018 to August 2018 |
More CH18 O plates
Browse all CH18 O registrations from Cardiff.
About CH18 OEM
What car is CH18 OEM?
CH18 OEM is a black Audi A3, petrol (999cc). First registered in Cardiff in 2018.
What is the mileage of CH18 OEM?
The last recorded mileage for CH18 OEM was 69,683 miles, recorded on 18 May 2026 during its most recent MOT test.
Has CH18 OEM passed its MOT?
CH18 OEM has had 7 MOT tests with an 100% pass rate (7 passes, 0 failures). It last passed on 18 May 2026.
Is CH18 OEM ULEZ compliant?
Based on its fuel type and registration year, CH18 OEM 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 CH18 OEM?
CH18 OEM is approximately 8 years old. Age identifier 18 means registered between 1 March 2018 and 31 August 2018.