Is the 2021 MAZDA 6 reliable?

Excellent reliability. Very few MOT failures. 93% of MAZDA 6s from 2021 passed their MOT first time in 2026, based on 118 tests. That's 11 points above the national average of 82%.

How much does a 2021 MAZDA 6 cost to run?

Estimated annual running cost is £1,777 (£148/month), including £1327 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2021 MAZDA 6?

The 2021 MAZDA 6 has a 93% MOT pass rate based on 118 tests in 2026. This ranks 1715 out of 3373 cars from 2021.

Which year MAZDA 6 is most reliable?

The 2020 MAZDA 6 has the highest MOT pass rate at 94%. The least reliable year is 2002 at 54%.

MAZDA 6 (2021)

Q: What is the average mileage for a 2021 MAZDA 6?

The average mileage for a 2021 MAZDA 6 is 26,540 miles, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Running costs, reliability data, and common problems from 118 real MOT tests.

Annual Cost

£1,777

£148/month

MOT Pass Rate

93%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 18-32

1998cc Petrol

Great Choice

93% pass rate, £1777/year to run. 11 points above average.

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Petrol1998cc5 years old118 tests27k miles avg

Annual Running Costs

Fuel (Petrol, 1998cc)

~36 mpg

£1,327

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,777

Per month£148/mo

Per week£34/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

93% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 11 points above the national average of 82%. It also outperforms the MAZDA brand average of 81%.

At 5 years old, 93% of MAZDA 6s from 2021 passed their MOT first time in 2026. That's based on 118 tests across the UK. The average mileage at this age is 26,540 miles.

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How Does It Compare?

Rank among 2021 cars1715th of 3,373(top 51%)

Rank among MAZDA models136th of 483(top 28%)

vs national average+11%(82% avg)

vs 2021 cars average+1%(92% avg)

vs MAZDA average+12%(81% avg)

Mileage Analysis

26,540

Average miles

37,000

Expected for age

The average 2021 MAZDA 6 has 26,540 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Best Year to Buy?

The most reliable year is the 2020 model with a 94% MOT pass rate, while the 2002 model has the lowest at 54%. The 2021 sits between the two at 93%.

MAZDA 6 by Year

Year	Pass Rate	Tests	Avg Mileage
2021	93%	118	26,540 mi
2020	94%	1,786	31,783 mi
2019	91%	7,381	44,030 mi
2018	89%	5,151	55,840 mi
2017	87%	7,764	68,812 mi
2016	84%	11,771	78,854 mi
2015	82%	11,898	88,374 mi
2014	80%	11,144	97,838 mi
2013	80%	7,682	103,079 mi
2012	75%	5,149	103,925 mi
2011	74%	7,535	117,021 mi
2010	73%	9,673	121,783 mi
2009	73%	7,396	124,353 mi
2008	71%	6,498	124,138 mi
2007	68%	4,401	109,611 mi
2006	69%	2,430	105,119 mi
2005	64%	1,596	100,805 mi
2004	62%	763	99,968 mi
2003	63%	356	98,803 mi
2002	54%	140	98,087 mi

Similar Cars to Consider

VOLKSWAGEN GOLF

2019 · 1498cc Petrol

£1,582/year

92%

-1%

NISSAN QASHQAI

2020 · 1598cc Petrol

£1,582/year

93%

same

MINI COOPER

2019 · 1499cc Petrol

£1,582/year

92%

-1%

HYUNDAI TUCSON

2019 · 1591cc Petrol

£1,582/year

90%

-3%

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About the 2021 MAZDA 6

The 2021 MAZDA 6 is a family car with a 1998cc petrol engine. 118 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model beats that benchmark.

With an average of 26,540 miles at 5 years old, MAZDA 6 owners tend to use this car less than the typical driver.

2021 MAZDA 6 Fuel Costs

The 1998cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 2021 MAZDA 6?

Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 93% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

MAZDA 6 Reliability Trend

Newer MAZDA 6s show better MOT pass rates than older ones, with an average improvement of 18 percentage points.

Buying a Used 2021 MAZDA 6

At 5 years old, the MAZDA 6 offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2020 model has the highest pass rate at 94%.

Common Issues to Watch For

Based on the 2021 MAZDA 6's fuel type, age, and engine size, these are the most likely problem areas to check.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2021 MAZDA 6 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MAZDA 6(2021)	93%	£1327	£195	Grp 18-32	£1777
VOLKSWAGEN GOLF(2019)	92%	£1137	£190	Grp 12-25	£1582-£195
NISSAN QASHQAI(2020)	93%	£1137	£190	Grp 12-25	£1582-£195
MINI COOPER(2019)	92%	£1137	£190	Grp 12-25	£1582-£195
HYUNDAI TUCSON(2019)	90%	£1137	£190	Grp 12-25	£1582-£195

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.