Mazda CX-30 reliability, MPG and running costs
Figures updated
The Mazda CX-30 is a car. In 2024 MOT tests it scored 136 for reliability (100 is average), ranking 94 of 442, and 8.6% failed first time against a UK average of 28.5%. Its most common MOT failure is condition (1.5% of tests).
Ranked 94 of 442 cars in the 2024 MOT Reliability League
In 2024, 11,789 Mazda CX-30s aged 3 to 20 had an MOT and 8.6% failed first time (UK average 28.5%). Taking age and mileage into account, the Mazda CX-30 is 26% less likely to fail than the average car of the same age and mileage. At the first MOT, at three years old, 8.4% failed (UK 12.7%).
First-time fail rate
8.6%
UK 28.5%
Fail rate at 3 years
8.4%
UK 12.7%
Average miles a year
7,600
Typical age at test: 3 years
Mazda CX-30 MOT failure rate by age
Most common Mazda CX-30 MOT faults
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.5% of tests
- Wipers: does not clear the windscreen effectively1.3% of tests
- Tread depth: tread depth below requirements of 1.6mm1.1% of tests
- Brake pads: less than 1.5 mm thick1.0% of tests
- Washers: provides insufficient washer liquid0.9% of tests
- Headlamp aim: too high0.6% of tests
What the Mazda CX-30 fails on
| Area | Tests failing | vs similar cars |
|---|---|---|
| Tyres | 3.3% | ▼ 30% less often |
| Visibility | 2.4% | ▼ 18% less often |
| Brakes | 1.6% | About average |
| Lights and electrics | 1.2% | ▼ 50% less often |
| Exhaust and emissions | 0.6% | ▲ 1.1× as often |
| Suspension | 0.4% | ▼ 30% less often |
| Body and structure | 0.1% | ▼ 70% less often |
| Seat belts and airbags | 0.0% | ▼ 86% less often |
| Wheels | 0.0% | ▼ 76% less often |
| Steering | 0.0% | ▼ 68% less often |
What MPG does the Mazda CX-30 do?
Official economy for the Mazda CX-30 ranges from 40.4 to 50.4mpg across the 272 versions listed by the Vehicle Certification Agency (2020–2025). A typical petrol version manages 47.1mpg. Expect 10–15% less in real-world driving.
Work out a journey's fuel costHow much is road tax on a Mazda CX-30?
Any Mazda CX-30 first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates).
Work out tax for a specific carMazda CX-30 specs and running costs
Official figures for 272 versions sold in the UK between 2020 and 2025.
Fuel types
Petrol
Official economy
40.4–50.4 mpg
CO2
127–160 g/km
Power
90–186 PS
| Version | Fuel | Economy | CO2 | Car tax | Company car tax |
|---|---|---|---|---|---|
| CX-30 2.5 140ps 2WD Homura / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 2.5 140ps 2WD Exclusive-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 2.5 140ps 2WD Takumi / Black Leather (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 2.5 140ps 2WD Centre-Line Auto / Dark Grey Cloth (06/24)140 PS · 6AT · listed 2025 | Petrol | 43.5 mpg | 147g | £200 | 35% |
| CX-30 2.5 140ps 2WD Homura Auto / Dark Grey Cloth (06/24)140 PS · 6AT · listed 2025 | Petrol | 43.5 mpg | 147g | £200 | 35% |
| CX-30 2.5 140ps 2WD Exclusive-Line Auto / Dark Grey Cloth (06/24)140 PS · 6AT · listed 2025 | Petrol | 43.5 mpg | 147g | £200 | 35% |
| CX-30 2.5 140ps 2WD Takumi Auto / Black Leather (06/24)140 PS · 6AT · listed 2025 | Petrol | 43.5 mpg | 147g | £200 | 35% |
| CX-30 2.5 140ps 2WD Prime-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 2.5 140ps 2WD Centre-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Prime-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Homura / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Exclusive-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Centre-Line / Dark Grey Cloth (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Takumi / Black Leather (06/24)140 PS · 6MT · listed 2025 | Petrol | 47.1 mpg | 135g | £200 | 33% |
| CX-30 Mazda CX-30 2.5 140ps 2WD Centre-Line Auto / Dark Grey Cloth (06/24)140 PS · 6AT · listed 2025 | Petrol | 43.5 mpg | 147g | £200 | 35% |
Economy and CO2 are official WLTP figures. Car tax is the yearly rate at current rates for a car first registered in the year listed, before any expensive car supplement. Company car tax is the 2026/27 benefit-in-kind rate. Showing the 15 most recent of 272 versions.
What a Mazda CX-30 costs to fuel
- petrol, typical official 47.1mpg…
Official figures are usually 10–15% better than real-world driving.
Work out a journey in a Mazda CX-30Buying a used Mazda CX-30?
Check the MOT history of the exact car: every result, advisory and mileage reading, free.
Other Mazda models
Frequently asked questions
›Is the Mazda CX-30 reliable?
Its MOT record is better than average: the Mazda CX-30 is 26% less likely to fail than the average car of the same age and mileage, with a reliability score of 136 in our 2024 league (100 is average).
›What are common problems with the Mazda CX-30?
The most common MOT fault is “Condition: has a cut in excess of the requirements deep enough to reach the ply or cords”, found in 1.5% of tests.
›What MPG does the Mazda CX-30 do?
Official economy for the Mazda CX-30 ranges from 40.4 to 50.4mpg across the 272 versions listed by the Vehicle Certification Agency (2020–2025). A typical petrol version manages 47.1mpg. Expect 10–15% less in real-world driving.
›How much is road tax on a Mazda CX-30?
Any Mazda CX-30 first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates).
›How many Mazda CX-30s fail their MOT?
8.6% of Mazda CX-30s aged 3 to 20 failed their MOT first time in 2024, and 8.4% failed at their first MOT.
Sources: DVSA anonymised MOT tests 2024, all versions of the Mazda CX-30 combined (Open Government Licence v3.0); official economy and CO2 from Vehicle Certification Agency data, © Crown copyright. VCA cannot accept liability for its accuracy. How we calculate the league.