MERCEDES G-CLASS (2021)
Running costs, common problems, and reliability data based on 65 real MOT tests in 2024.
MOT Pass Rate
78%
Total Tests (2024)
65
Avg Mileage
30,190 mi
Est. Annual Cost
£1,782
Is the 2021 MERCEDES G-CLASS reliable?
Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 3 years old, 78% of MERCEDES G-CLASSs from 2021 passed their MOT first time in 2024. That's based on 65 tests across the UK. The average mileage at this age is 30,190 miles.
How does the 2021 MERCEDES G-CLASS compare?
Mileage Analysis
The average 2021 MERCEDES G-CLASS has 30,190 miles on the clock, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Best year to buy a MERCEDES G-CLASS?
The most reliable year is the 2020 model with a 98% MOT pass rate, while the 2021 model has the lowest at 78%. Consider a different year if reliability is a priority.
How much does a 2021 MERCEDES G-CLASS cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES G-CLASS by Year
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2021 | 78% | 65 | 30,190 mi |
| 2020 | 98% | 66 | 32,570 mi |
| 2019 | 96% | 319 | 41,698 mi |
| 2018 | 94% | 807 | 39,199 mi |
| 2017 | 86% | 691 | 43,730 mi |
| 2016 | 94% | 604 | 58,012 mi |
| 2015 | 88% | 591 | 48,991 mi |
| 2014 | 92% | 362 | 54,969 mi |
| 2013 | 94% | 449 | 69,675 mi |
| 2012 | 90% | 221 | 76,209 mi |
| 2011 | 96% | 92 | 70,666 mi |
| 2010 | 73% | 33 | 78,145 mi |
| 2007 | 100% | 35 | 103,461 mi |
| 2001 | 60% | 42 | 93,234 mi |
| 1999 | 82% | 44 | 113,541 mi |
Checking a specific MERCEDES G-CLASS?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 MERCEDES G-CLASS
The 2021 MERCEDES G-CLASS is a family car with a 1950cc diesel engine. 65 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 99% of 2021 cars for MOT pass rates.
With an average of 30,190 miles at 3 years old, MERCEDES G-CLASS owners cover more miles than the average driver.
2021 MERCEDES G-CLASS Fuel Costs
The 1950cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 per year at current diesel prices of 148p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 MERCEDES G-CLASS?
Total estimated annual running cost is £1,782 (£149/month), broken down as £1037 fuel, £190 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 78% pass rate. Keeping on top of servicing will help avoid surprises.
MERCEDES G-CLASS Reliability Trend
The MERCEDES G-CLASS has maintained consistent MOT pass rates across model years, varying by only 1 percentage points.
Buying a Used 2021 MERCEDES G-CLASS
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. Note: with only 65 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2021 MERCEDES G-CLASS
If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- FORD FOCUS (2019) 89% pass rate (+11%) from 93,803 tests
- MERCEDES A (2019) 91% pass rate (+13%) from 89,588 tests
- FORD KUGA (2019) 91% pass rate (+13%) from 72,831 tests
- VOLKSWAGEN POLO (2019) 89% pass rate (+11%) from 65,751 tests