Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA (2021)

Estimated running costs and MOT pass rates from 424 MOT tests in 2024.

Annual Cost

£2,281

£190/month

MOT Pass Rate

86%

Good

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 30-42

2925cc Diesel

Solid Option

86% pass rate, £2,281/year to run. Close to the average across all models.

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Diesel2925cc5 years old424 tests26k miles avg

Annual Running Costs

Fuel (Diesel, 2925cc)

~40 mpg

£1,676

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

£350

Total per year£2,281

Per month£190/mo

Per week£44/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

86% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data.

86% of MOT tests on Mercedes CLS400 AMG LN NT Ed Prm+ D 4MAs from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 424 tests across the UK, retests included. The average mileage recorded at those tests was 26,272 miles.

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How Does It Compare?

Rank among 2021 models3009th of 3,336(bottom 10%)

Rank among Mercedes models849th of 1,376(bottom half)

vs average of all models+4%(82% avg)

vs 2021 models average-6%(92% avg)

vs Mercedes average-1%(87% avg)

Mileage Analysis

26,272

Average miles

22,200

Expected for age

The average 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA had 26,272 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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Similar Cars to Consider

Mercedes E

2019 · 2925cc Diesel

£2,131/year

90%

+4%

Ford Ranger

2019 · 3198cc Diesel

£2,281/year

87%

+1%

Audi Q5

2019 · 2967cc Diesel

£2,131/year

93%

+7%

Audi A5

2019 · 2967cc Diesel

£2,131/year

90%

+4%

Check a Specific Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA

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About the 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA

The 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA is a premium performance car. Our records list a 2925cc diesel engine, though engines vary between versions. 424 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. It sits in the bottom 10% of 2021 models for MOT pass rate.

With an average of 26,272 miles recorded at its 2024 MOT tests, Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA owners drive about as much as the UK average.

2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA Fuel Costs

The 2925cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,676 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). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.

What does it cost to own a 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA?

Total estimated annual running cost is £2,281 (£190/month), broken down as £1,676 fuel, £200 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 86% pass rate. Keeping on top of servicing will help avoid surprises.

Buying a Used 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA

At 5 years old, the Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA 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.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Medium risk

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Low risk

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Medium risk

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

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 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA 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
Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA(2021)	86%	£1,676	£200	Grp 30-42	£2,281
Mercedes E(2019)	90%	£1,676	£200	Grp 30-42	£2,131-£150
Ford Ranger(2019)	87%	£1,676	£200	Grp 35-50	£2,281same
Audi Q5(2019)	93%	£1,676	£200	Grp 30-42	£2,131-£150
Audi A5(2019)	90%	£1,676	£200	Grp 30-42	£2,131-£150

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 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA

Is the 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA reliable?

Good reliability. Occasional issues but generally solid. 86% of MOT tests on 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MAs ended in a pass, from 424 tests (DVSA MOT data for tests in 2024, retests included). That's 4 points above the average of 82% across all models in the same data.

How much does a 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA cost to run?

Our estimate is £2,281 a year (£190 a month): £1,676 fuel, £200 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA?

86% of 424 MOT tests on the 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 3009th of 3,336 models first registered in 2021 (bottom 10%).

What is the average mileage for a 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA?

The average mileage recorded at MOT tests on the 2021 Mercedes CLS400 AMG LN NT Ed Prm+ D 4MA is 26,272 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.