AUDI A4 (2021)
Running costs, common problems, and reliability data based on 531 real MOT tests in 2024.
MOT Pass Rate
96%
Total Tests (2024)
531
Avg Mileage
25,826 mi
Est. Annual Cost
£1,772
Is the 2021 AUDI A4 reliable?
Excellent reliability. Very few MOT failures. That's 14 points above the national average of 82%. It also outperforms the AUDI brand average of 90%.
At 3 years old, 96% of AUDI A4s from 2021 passed their MOT first time in 2024. That's based on 531 tests across the UK. The average mileage at this age is 25,826 miles.
How does the 2021 AUDI A4 compare?
Mileage Analysis
The average 2021 AUDI A4 has 25,826 miles on the clock, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
How much does a 2021 AUDI A4 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.
AUDI A4 by Year
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2021 | 96% | 531 | 25,826 mi |
| 2020 | 92% | 13,420 | 39,596 mi |
| 2019 | 91% | 25,771 | 48,333 mi |
| 2018 | 89% | 27,431 | 57,063 mi |
| 2017 | 88% | 41,848 | 70,662 mi |
| 2016 | 85% | 41,258 | 82,779 mi |
| 2015 | 85% | 31,961 | 92,608 mi |
| 2014 | 84% | 33,458 | 102,945 mi |
| 2013 | 84% | 32,559 | 109,938 mi |
| 2012 | 83% | 26,765 | 120,869 mi |
| 2011 | 82% | 26,901 | 130,117 mi |
| 2010 | 80% | 25,855 | 136,452 mi |
| 2009 | 79% | 26,384 | 138,021 mi |
| 2008 | 78% | 31,415 | 137,710 mi |
| 2007 | 77% | 30,996 | 136,433 mi |
| 2006 | 76% | 26,758 | 137,214 mi |
| 2005 | 75% | 15,245 | 139,515 mi |
| 2004 | 74% | 12,946 | 146,260 mi |
| 2003 | 74% | 7,402 | 148,576 mi |
| 2002 | 72% | 3,944 | 156,746 mi |
| 2001 | 74% | 1,748 | 148,131 mi |
| 2000 | 76% | 1,674 | 149,460 mi |
| 1999 | 76% | 2,062 | 160,008 mi |
| 1998 | 75% | 1,597 | 153,893 mi |
| 1997 | 74% | 842 | 161,934 mi |
| 1996 | 77% | 556 | 158,416 mi |
| 1995 | 61% | 208 | 153,421 mi |
Checking a specific AUDI A4?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 AUDI A4
The 2021 AUDI A4 is a premium with a 1984cc petrol engine. 531 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. It ranks in the top 17% of all 2021 cars for reliability.
With an average of 25,826 miles at 3 years old, AUDI A4 owners drive about as much as the UK average.
2021 AUDI A4 Fuel Costs
The 1984cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 AUDI A4?
Total estimated annual running cost is £1,772 (£148/month), broken down as £1327 fuel, £190 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.
AUDI A4 Reliability Trend
Newer AUDI A4s show better MOT pass rates than older ones, with an average improvement of 12 percentage points.
Buying a Used 2021 AUDI A4
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.
Alternatives to the 2021 AUDI A4
The AUDI A4 is actually the most reliable option among similar petrol premiums from this era. Here are comparable petrol cars with similar engines:
- VOLKSWAGEN GOLF (2019) 92% pass rate (-4%) from 89,653 tests
- NISSAN QASHQAI (2020) 93% pass rate (-3%) from 52,321 tests
- MINI COOPER (2019) 92% pass rate (-4%) from 52,140 tests
- HYUNDAI TUCSON (2019) 90% pass rate (-6%) from 42,920 tests