Mercedes C 300 AMG Line Edition Prem A (2021)
Estimated running costs and MOT pass rates from 44 MOT tests in 2024.
Annual Cost
£2,386
£199/month
MOT Pass Rate
77%
Average
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 18-32
1991cc Hybrid
Check Carefully
77% pass rate, £2,386/year to run. 5 points below average.
Check a specific Mercedes C 300 AMG Line Edition Prem A
Enter a reg plate for full MOT history, mileage check, health score, running costs, and reliability data. Free, instant, no signup.
Annual Running Costs
~36 mpg (petrol-engine estimate; hybrids usually use less)
Standard rate (from April 2017)
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
Average reliability. Expect some repairs as it ages. That's close to the average of 82% across all models in our data. It falls below the Mercedes brand average of 87%.
77% of MOT tests on Mercedes C 300 AMG Line Edition Prem As from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 44 tests across the UK, retests included. The average mileage recorded at those tests was 24,333 miles.
Got a Mercedes C 300 AMG Line Edition Prem A you're looking at?
Enter the reg plate to check its specific MOT history, mileage, and health score.
How Does It Compare?
Mileage Analysis
24,333
Average miles
22,200
Expected for age
The average 2021 Mercedes C 300 AMG Line Edition Prem A had 24,333 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.
Looking at a specific Mercedes C 300 AMG Line Edition Prem A?
Enter its reg plate for a free check with full MOT history, mileage verification, and predicted costs.
Mercedes C 300 AMG Line Edition Prem A by Year
Similar Cars to Consider
Check a Specific Mercedes C 300 AMG Line Edition Prem A
Enter a reg plate to get the full MOT history, health score, and mileage verification.
Upgrade to Premium (£4.99) for stolen, finance, and write-off checks.
About the 2021 Mercedes C 300 AMG Line Edition Prem A
The 2021 Mercedes C 300 AMG Line Edition Prem A is a premium car. Our records list a 1991cc hybrid engine, though engines vary between versions. 44 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It sits in the bottom 1% of 2021 models for MOT pass rate.
With an average of 24,333 miles recorded at its 2024 MOT tests, Mercedes C 300 AMG Line Edition Prem A owners drive about as much as the UK average.
2021 Mercedes C 300 AMG Line Edition Prem A Fuel Costs
The 1991cc hybrid engine offers a reasonable balance between performance and economy. Our estimate uses around 36 mpg, the figure for a petrol engine of this size, which works out to roughly £1,631 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). 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 2021 Mercedes C 300 AMG Line Edition Prem A?
Total estimated annual running cost is £2,386 (£199/month), broken down as £1,631 fuel, £200 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 77% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 Mercedes C 300 AMG Line Edition Prem A
At 5 years old, the Mercedes C 300 AMG Line Edition Prem A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 44 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.
Hybrid Battery Health
Medium riskAfter 5 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 riskThe 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 riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 Mercedes C 300 AMG Line Edition Prem A 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 C 300 AMG Line Edition Prem A(2021) | 77% | £1,631 | £200 | Grp 18-32 | £2,386 |
| Toyota Yaris(2019) | 93% | £1,398 | £200 | Grp 12-25 | £1,853-£533 |
| MINI Cooper S(2019) | 92% | £1,398 | £200 | Grp 12-25 | £1,853-£533 |
| Land Rover Range Rover Sport(2019) | 94% | £1,631 | £200 | Grp 18-32 | £2,086-£300 |
| Toyota Prius(2019) | 94% | £1,631 | £200 | Grp 18-32 | £2,086-£300 |
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 C 300 AMG Line Edition Prem A
Is the 2021 Mercedes C 300 AMG Line Edition Prem A reliable?
Average reliability. Expect some repairs as it ages. 77% of MOT tests on 2021 Mercedes C 300 AMG Line Edition Prem As ended in a pass, from 44 tests (DVSA MOT data for tests in 2024, retests included). That's 5 points below the average of 82% across all models in the same data.
How much does a 2021 Mercedes C 300 AMG Line Edition Prem A cost to run?
Our estimate is £2,386 a year (£199 a month): £1,631 fuel, £200 road tax, £55 MOT and £500 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2021 Mercedes C 300 AMG Line Edition Prem A?
77% of 44 MOT tests on the 2021 Mercedes C 300 AMG Line Edition Prem A ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 3309th of 3,336 models first registered in 2021 (bottom 1%).
What is the average mileage for a 2021 Mercedes C 300 AMG Line Edition Prem A?
The average mileage recorded at MOT tests on the 2021 Mercedes C 300 AMG Line Edition Prem A is 24,333 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
Related Mercedes Models
Explore other Mercedes cars or similar models in the same category.
Mercedes A
2019 · 1461cc Diesel
Mercedes C
2017 · 1991cc Hybrid
Mercedes A-Class
2017 · 1461cc Diesel
Toyota Yaris
2019 · 1497cc Hybrid
MINI Cooper S
2019 · 1499cc Hybrid
Land Rover Range Rover Sport
2019 · 1997cc Hybrid
Related Guides
In-depth articles relevant to the Mercedes C 300 AMG Line Edition Prem A.
Cars That Lose Value Fastest: Models to Avoid for Depreciation
8 min read
Running CostsCheapest Cars to Run in 2026: Running Costs From DVSA MOT Data
9 min read
Running CostsCheapest Cars to Insure in the UK: Insurance Groups 1-10
9 min read
Buying GuideFord Fiesta Common Problems (2026): What to Check Before Buying
13 min read
ReliabilityFord Puma Common Problems: 7 Issues That Could Cost £1,500+ (2026)
13 min read
Check a specific Mercedes C 300 AMG Line Edition Prem A
Enter the reg to see its MOT history, mileage check, and predicted costs.
Premium History Check
Buying a Mercedes C 300 AMG Line Edition Prem A? Our premium check covers:
- Stolen check (PNC)
- Outstanding finance
- Write-off history (Cat A/B/N/S)
- Previous owners count
With outstanding finance included