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 2021 Skoda Fabia Petrol 999cc has had 4 MOT tests on record, passing 3 and failing once (75% pass rate). It has 50,862 miles on the clock, averaging 2,917 miles per year, well below the UK average of 7,400. The 1.0 TSI engine is known for 1. carbon buildup on intake valves and 2. turbocharger actuator/wastegate linkage failure. Common Skoda Fabia issues include electric window switches and mechanisms and infotainment system (bolero unit).
MOT & Mileage History for GM21 STZ
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
Low mileage| Latest reading | 50,862 miles |
| Reading date | |
| Miles last year | 2,846 |
| Average per year | 2,917 |
| Mileage consistency | Consistent |
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Full MOT Test History 4 tests on record
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Reported issues for this Skoda Fabia
These are the most commonly reported problems on Skoda Fabia models (2014–2021), based on owner reports and workshop data across the UK.
Electric window switches and mechanisms
Window switches corrode from water ingress (rain splashes when windows open), causing intermittent failure; window motors or regulators also wear prematurely. · Typical repair: £150-£300 (switch replacement £100-£150 parts/labour; full regulator £200-£300 at indie garage).
Infotainment system (Bolero unit)
Software glitches, overheating, or water/corrosion damage to connections lead to freezing, blackouts, or total failure. · Typical repair: £200-£500 (software update/diagnostic £100-£200; full unit replacement £400-£500).
Instrument cluster wiring
Faulty wiring harness in the cluster corrodes or chafes, causing intermittent power loss. · Typical repair: £250-£450 (rewire/diagnostic £200-£300; cluster repair £300-£450).
Rear door seals
Rubber seals degrade or misalign, allowing water leaks into rear footwells. · Typical repair: £100-£250 (seal replacement both sides £80-£150 parts/labour).
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]
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Vehicle Details
| Registration | GM21 STZ |
| Make | Skoda |
| Model | Fabia |
| Colour | White |
| Fuel type | Petrol |
| Engine | 999cc |
| Year | 2021 |
| First registered | |
| Area code | GM — Maidstone, Garden of England |
| Age identifier | 21 — March 2021 to August 2021 |
More GM21 S plates
Browse all GM21 S registrations from Maidstone.
About GM21 STZ
What car is GM21 STZ?
GM21 STZ is a white Skoda Fabia, petrol (999cc). First registered in Maidstone in 2021.
What is the mileage of GM21 STZ?
The last recorded mileage for GM21 STZ was 50,862 miles, recorded on 12 Dec 2025 during its most recent MOT test.
Has GM21 STZ passed its MOT?
GM21 STZ has had 4 MOT tests with a 75% pass rate (3 passes, 1 failure). It last passed on 12 Dec 2025.
Is GM21 STZ ULEZ compliant?
Based on its fuel type and registration year, GM21 STZ 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 GM21 STZ?
GM21 STZ is approximately 5 years old. Age identifier 21 means registered between 1 March 2021 and 31 August 2021.