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 Audi A3 Petrol 999cc has had 10 MOT tests on record, passing 7 and failing 3 (70% pass rate). It has 78,550 miles on the clock, averaging 9,756 miles per year, above 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 ET66 MXS
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
Above average| Latest reading | 78,550 miles |
| Reading date | |
| Average per year | 9,756 |
| Mileage consistency | Consistent |
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- Warranty work logged
Full MOT Test History 10 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 | ET66 MXS |
| Make | Audi |
| Model | A3 |
| Colour | Grey |
| Fuel type | Petrol |
| Engine | 999cc |
| Year | 2017 |
| First registered | |
| Area code | ET — Chelmsford, Essex |
| Age identifier | 66 — September 2016 to February 2017 |
More ET66 M plates
Browse all ET66 M registrations from Chelmsford.
About ET66 MXS
What car is ET66 MXS?
ET66 MXS is an grey Audi A3, petrol (999cc). First registered in Chelmsford in 2017.
What is the mileage of ET66 MXS?
The last recorded mileage for ET66 MXS was 78,550 miles, recorded on 20 Jan 2026 during its most recent MOT test.
Has ET66 MXS passed its MOT?
ET66 MXS has had 10 MOT tests with a 70% pass rate (7 passes, 3 failures). It last passed on 20 Jan 2026.
Is ET66 MXS ULEZ compliant?
Based on its fuel type and registration year, ET66 MXS 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 ET66 MXS?
ET66 MXS is approximately 9 years old. Age identifier 66 means registered between 1 September 2016 and 28 February 2017.