BMW 4 Series Reliability, MOT Pass Rate & Common Faults
Free BMW 4 Series car check
Is the BMW 4 Series reliable? We analysed 14,824 real MOT tests across 1,580 vehicles to find out.
Got a specific BMW 4 Series? Enter the reg for a free check:
The BMW 4 Series is above average for reliability based on real UK MOT data. Here's everything you need to know before buying a used BMW 4 Series.
BMW 4 Series Number Plates
Number plates registered to a BMW 4 Series. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
BMW 4 Series MOT Pass Rate by Year
How likely is a BMW 4 Series to pass its MOT? Here's the pass rate for each registration year, newest first.
BMW 4 Series Problems — What Goes Wrong?
The most common reasons a BMW 4 Series fails its MOT, ranked by how often they occur. Check for these problems before you buy.
BMW 4 Series Common Faults & Problems
These are the most common serious faults found on BMW 4 Series models during MOT testing — flagged as dangerous or major failures that need immediate attention.
BMW 4 Series Mileage — What's Normal?
How many miles does a typical BMW 4 Series owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
BMW 4 Series MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the BMW 4 Series year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2019 | 233 | 91.0% | 13,340 | 21,743 | 33,856 |
| 2018 | 739 | 91.9% | 13,952 | 20,557 | 30,460 |
| 2017 | 408 | 91.4% | 5,016 | 20,464 | 43,823 |
| 2016 | 157 | 91.1% | 33,489 | 51,213 | 68,966 |
| 2015 | 399 | 84.5% | 39,236 | 57,047 | 81,406 |
| 2014 | 3,881 | 86.1% | 35,296 | 55,420 | 80,715 |
| 2013 | 8,908 | 85.4% | 39,614 | 63,143 | 90,592 |
How Long Does a BMW 4 Series Last?
Based on 1,580 BMW 4 Series vehicles on UK roads.
BMW 4 Series Mileage Distribution
Total mileage recorded across all BMW 4 Series MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used BMW 4 Series
Based on MOT pass rates across all registration years with sufficient test data.
91.9% MOT pass rate from 739 tests
84.5% MOT pass rate from 399 tests
The best year to buy a used BMW 4 Series is 2018, which has the highest MOT pass rate at 91.9% across 739 tests. The 2015 model year has the lowest pass rate at 84.5% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the BMW 4 Series Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| BMW 4 Series THIS CAR | 86.2% | 14,824 | 56,390 mi | 13 yrs |
| BMW 3 Series | 75.1% | 12,840,406 | 90,743 mi | 37 yrs |
| BMW 118 | 81.5% | 1,923,256 | 64,042 mi | 22 yrs |
| BMW X5 | 77% | 1,735,343 | 83,401 mi | 25 yrs |
| Lexus LS460 | 85.7% | 6,784 | 69,397 mi | 20 yrs |
Compared to the BMW 3 Series (75.1% pass rate) and the BMW 118 (81.5% pass rate), the BMW 4 Series outperforms both on MOT reliability.
Found a BMW 4 Series you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific BMW 4 SeriesShould you buy a used BMW 4 Series?
The BMW 4 Series has an overall MOT pass rate of 86.2% across 14,824 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common failure point is tyre has ply or cords exposed with 49 recorded occurrences. Check for this on any test drive or pre-purchase inspection.
On the safety side, the most frequently flagged dangerous fault is tyre tread depth below requirements of 1.6mm. Dangerous faults cause an immediate MOT failure and mean the vehicle is not roadworthy until repaired. If you're viewing a BMW 4 Series with an expired or recently passed MOT, ask the seller whether any dangerous faults were found and fixed during the last test.
A typical BMW 4 Series owner drives around 6,924 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most BMW 4 Series models stay on UK roads for around 13 years. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.