BMW 420D M Sport MHEV Auto (2020)

Estimated running costs and MOT pass rates from 130 MOT tests in 2024.

Annual Cost

£1,852

£154/month

MOT Pass Rate

98%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 18-32

1995cc Diesel hybrid

Great Choice

98% pass rate, £1,852/year to run. 16 points above average.

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Diesel hybrid1995cc6 years old130 tests34k miles avg

Annual Running Costs

Fuel (Diesel hybrid, 1995cc)

~48 mpg (diesel-engine estimate; hybrids usually use less)

£1,397

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,852

Per month£154/mo

Per week£36/wk

Estimates based on 7,400 miles/year (UK average), diesel at 199.33p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

98% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 16 points above the average of 82% across all models in our data. It also outperforms the BMW brand average of 88%.

98% of MOT tests on BMW 420D M Sport MHEV Autos from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 130 tests across the UK, retests included. The average mileage recorded at those tests was 33,858 miles.

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How Does It Compare?

Rank among 2020 models136th of 2,554(top 6%)

Rank among BMW models71st of 1,548(top 5%)

vs average of all models+16%(82% avg)

vs 2020 models average+6%(92% avg)

vs BMW average+10%(88% avg)

Mileage Analysis

33,858

Average miles

29,600

Expected for age

The average 2020 BMW 420D M Sport MHEV Auto had 33,858 miles on the clock at its 2024 MOT, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.

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BMW 420D M Sport MHEV Auto by Year

Year	Pass Rate	Tests	Avg Mileage
2022	96%	197	23,856 mi
2021	90%	2,262	28,824 mi
2020	98%	130	33,858 mi

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Land Rover Discovery Sport R-DYN SE D A

2020 · 1999cc Diesel hybrid

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BMW 520D M Sport MHEV Auto

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£2,002/year

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BMW 320D M Sport MHEV Auto

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£1,852/year

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Volvo XC90 R-Design B5 MHEV Awd Auto

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About the 2020 BMW 420D M Sport MHEV Auto

The 2020 BMW 420D M Sport MHEV Auto is a premium car. Our records list a 1995cc diesel hybrid engine, though engines vary between versions. 130 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 6% of all 2020 models for MOT pass rate.

With an average of 33,858 miles recorded at its 2024 MOT tests, BMW 420D M Sport MHEV Auto owners drive about as much as the UK average.

2020 BMW 420D M Sport MHEV Auto Fuel Costs

The 1995cc diesel hybrid engine offers a reasonable balance between performance and economy. Our estimate uses around 48 mpg, the figure for a diesel engine of this size, which works out to roughly £1,397 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year). As a hybrid it should use less than that, and real-world fuel costs depend a lot on how much electric-only driving you do.

What does it cost to own a 2020 BMW 420D M Sport MHEV Auto?

Total estimated annual running cost is £1,852 (£154/month), broken down as £1,397 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Buying a Used 2020 BMW 420D M Sport MHEV Auto

At 6 years old, the BMW 420D M Sport MHEV Auto offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Hybrid Battery Health

Medium risk

After 6 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.

Inverter and Power Electronics

Low risk

The inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.

Regenerative Braking

Medium risk

Brake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.

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 2020 BMW 420D M Sport MHEV Auto stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
BMW 420D M Sport MHEV Auto(2020)	98%	£1,397	£200	Grp 18-32	£1,852
Land Rover Discovery Sport R-DYN SE D A(2020)	90%	£1,397	£200	Grp 18-32	£1,852same
BMW 520D M Sport MHEV Auto(2021)	89%	£1,397	£200	Grp 18-32	£2,002+£150
BMW 320D M Sport MHEV Auto(2021)	91%	£1,397	£200	Grp 18-32	£1,852same
Volvo XC90 R-Design B5 MHEV Awd Auto(2021)	90%	£1,397	£200	Grp 18-32	£1,852same

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2020 BMW 420D M Sport MHEV Auto

Is the 2020 BMW 420D M Sport MHEV Auto reliable?

Excellent reliability. Very few MOT failures. 98% of MOT tests on 2020 BMW 420D M Sport MHEV Autos ended in a pass, from 130 tests (DVSA MOT data for tests in 2024, retests included). That's 16 points above the average of 82% across all models in the same data.

How much does a 2020 BMW 420D M Sport MHEV Auto cost to run?

Our estimate is £1,852 a year (£154 a month): £1,397 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2020 BMW 420D M Sport MHEV Auto?

98% of 130 MOT tests on the 2020 BMW 420D M Sport MHEV Auto ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 136th of 2,554 models first registered in 2020 (top 6%).

Which year BMW 420D M Sport MHEV Auto has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 BMW 420D M Sport MHEV Auto has the highest MOT pass rate at 98% and the 2021 the lowest at 90%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2020 BMW 420D M Sport MHEV Auto?

The average mileage recorded at MOT tests on the 2020 BMW 420D M Sport MHEV Auto is 33,858 miles, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.