BMW 340I (2021)
Estimated running costs and MOT pass rates from 49 MOT tests in 2024.
Annual Cost
£2,413
£201/month
MOT Pass Rate
96%
Excellent
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 30-42
2998cc Petrol
Great Choice
96% pass rate, £2,413/year to run. 14 points above average.
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Annual Running Costs
~30 mpg
Standard rate (from April 2017)
Low estimate due to excellent reliability
Estimates based on 7,400 miles/year (UK average), petrol at 174.57p 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
Excellent reliability. Very few MOT failures. That's 14 points above the average of 82% across all models in our data. It also outperforms the BMW brand average of 88%.
96% of MOT tests on BMW 340Is from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 49 tests across the UK, retests included. The average mileage recorded at those tests was 21,253 miles.
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How Does It Compare?
Mileage Analysis
21,253
Average miles
22,200
Expected for age
The average 2021 BMW 340I had 21,253 miles on the clock at its 2024 MOT, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
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Best Year to Buy?
Of the years with at least 100 tests, the 2016 model has the highest MOT pass rate at 95%, while the 2019 model has the lowest at 90%. The 2021 scores 96%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
BMW 340I by Year
Similar Cars to Consider
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About the 2021 BMW 340I
The 2021 BMW 340I is a premium performance car. Our records list a 2998cc petrol engine, though engines vary between versions. 49 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 21% of all 2021 models for MOT pass rate.
With an average of 21,253 miles recorded at its 2024 MOT tests, BMW 340I owners drive about as much as the UK average.
2021 BMW 340I Fuel Costs
The 2998cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).
What does it cost to own a 2021 BMW 340I?
Total estimated annual running cost is £2,413 (£201/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 96% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BMW 340I Reliability Trend
The BMW 340I has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2021 BMW 340I
At 5 years old, the BMW 340I 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 2016 model has the highest pass rate at 95%. Note: with only 49 tests in our data, these figures should be treated as indicative rather than definitive.
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.
Oil Consumption
Low riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
Service History
Low riskAlways 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 BMW 340I 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 340I(2021) | 96% | £1,958 | £200 | Grp 30-42 | £2,413 |
| BMW 5 Series(2019) | 92% | £1,958 | £200 | Grp 30-42 | £2,413same |
| BMW X3(2019) | 92% | £1,958 | £200 | Grp 30-42 | £2,413same |
| Mercedes GLC(2019) | 93% | £1,958 | £200 | Grp 30-42 | £2,413same |
| BMW X5(2019) | 92% | £1,958 | £200 | Grp 30-42 | £2,413same |
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 2021 BMW 340I
Is the 2021 BMW 340I reliable?
Excellent reliability. Very few MOT failures. 96% of MOT tests on 2021 BMW 340Is ended in a pass, from 49 tests (DVSA MOT data for tests in 2024, retests included). That's 14 points above the average of 82% across all models in the same data.
How much does a 2021 BMW 340I cost to run?
Our estimate is £2,413 a year (£201 a month): £1,958 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 2021 BMW 340I?
96% of 49 MOT tests on the 2021 BMW 340I ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 686th of 3,336 models first registered in 2021 (top 21%).
Which year BMW 340I has the best MOT pass rate?
Of the years with at least 100 tests, the 2016 BMW 340I has the highest MOT pass rate at 95% and the 2019 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 2021 BMW 340I?
The average mileage recorded at MOT tests on the 2021 BMW 340I is 21,253 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
Related BMW Models
Explore other BMW cars or similar models in the same category.
BMW 3 Series
2013 · 1995cc Diesel
BMW 5 Series
2018 · 2998cc Petrol
BMW 116
2014 · 1995cc Diesel
BMW 5 Series
2019 · 2998cc Petrol
BMW X3
2019 · 2998cc Petrol
Mercedes GLC
2019 · 2996cc Petrol
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