76%
BMW 3 Series
BMW 3 Series vs Audi A4
Buying a used BMW 3 Series or Audi A4? Compare their MOT pass rates, common problems, mileage and how they hold up as they get older.
Already found one of them? Check its finance, write-off, theft, mileage and keeper history with a £15 vehicle history report.
MOT pass rate head to head
Initial MOT tests in 2025, retests excluded. The UK average across all cars is 72.3%.
73%
Audi A4
2.9
percentage point gap in the BMW 3 Series's favour
A real gap, but not a decisive one on its own. The figures come from 478,900 tests of the BMW 3 Series and 243,352 of the Audi A4. The Audi A4 also arrives at test with roughly 7,211 more miles on average, which usually says more about who buys it and what they use it for than about how long it lasts.
A pass rate is not a reliability score. It records whether cars met the roadworthiness standard on test day.
Which one holds up better with age?
A headline pass rate mixes three-year-old cars with fifteen-year-old ones. Split by age, you can see what each model does over time.
The BMW 3 Series gives up less as it gets older. Between cars aged 3 to 5 years and those aged 11 years and over it loses 18.3 percentage points against 20.1 for the Audi A4, a difference of 1.8 points.
| Age at test | 3 Series | A4 |
|---|---|---|
| 3 to 5 years | 87.3% | 86.6% |
| 6 to 10 years | 82.5% | 77.6% |
| 11 years and over | 69.1% | 66.5% |
On a ten-year-old example that is the figure to weigh, not the headline number.
What each one fails on
The areas testers recorded most often across every failed 2025 test for each model, as a share of recorded failure items.
BMW 3 Series
Audi A4
The BMW 3 Series fails most often on lamps, reflectors and electrical equipment, the Audi A4 on suspension. Two different things to check on a viewing, and two different conversations to have with the seller. These are recorded failure categories, not faults every car has.
The specific items testers wrote down
One level deeper than the category: the individual defects recorded most often on each model.
BMW 3 Series
- Tread depth tread depth below requirements of 1.6mm
- Shock absorbers has a serious fluid leak
- Position lamp not working
Audi A4
- Coil spring fractured or broken
- Tread depth tread depth below requirements of 1.6mm
- Pins and bushes pin or bush excessively worn
What this comparison can't tell you
Everything above describes two models across the whole UK fleet. It says nothing about the one car in the advert. Two 3 Seriess of the same year and mileage can be worth thousands apart because of finance, a write-off, a theft record or a clocked odometer, none of which appear in MOT data.
Check the car you are about to buy. One £15 report, instant results, backed by a £30,000 data guarantee.
- Outstanding finance
- Write-off records
- Stolen markers
- Mileage history
- Previous keepers
Read more on each car
Other comparisons with these cars
BMW 3 Series vs Audi A4 FAQs
Is the BMW 3 Series or the Audi A4 more likely to pass its MOT?
The BMW 3 Series passed 76% of its initial MOT tests in the DVSA 2025 data against 73% for the Audi A4, a gap of 2.9 percentage points. That is a fleet-wide average, not a prediction about the specific car you are looking at.
Does a higher MOT pass rate mean a more reliable car?
No. An MOT records whether a vehicle met the roadworthiness standard on the day it was tested. It does not test the engine, clutch or gearbox, and it does not measure how often a car breaks down. Pass rates are useful for comparing how two models are holding up across the whole UK fleet, and nothing more than that.
Which holds up better with age, the BMW 3 Series or the Audi A4?
The BMW 3 Series. Between cars aged 3 to 5 years and those aged 11 years and over, it loses 18.3 percentage points of MOT pass rate against 20.1 for the Audi A4 in the 2025 data.
Which is cheaper to keep on the road, the BMW 3 Series or the Audi A4?
This data does not price servicing or repairs, so it cannot answer that directly. What it does show is what each model most often fails on, which is a fair guide to where the money goes. The BMW 3 Series fails most often on lamps, reflectors and electrical equipment. The Audi A4 fails most often on suspension.
Which one has covered more miles by MOT time?
The average Audi A4 arrived at its 2025 MOT on 105,790 miles, against 98,579 for the BMW 3 Series. That usually reflects who buys each car and what they use it for rather than how long it will last.
How do I check the actual BMW 3 Series I have found?
Enter its registration. A Carpeep car history check reports outstanding finance, insurance write-off markers, stolen markers, the mileage recorded at every MOT, previous keepers, tax and MOT status, import and export markers and scrapped status in one £15 report. None of that appears in model-level MOT statistics.
MOT figures are aggregated from the DVSA MOT Anonymised data set for 2025 (class 4 initial tests, retests excluded), licensed under the Open Government Licence v3.0. MOT results describe roadworthiness at test, not mechanical reliability.