BMW 420I M Sport Auto Reliability, MOT Pass Rate & Common Faults
Free BMW 420I M Sport Auto car check
Is the BMW 420I M Sport Auto reliable? We analysed 15,587 real MOT tests across 7,627 vehicles to find out.
Got a specific BMW 420I M Sport Auto? Enter the reg for a free check:
The BMW 420I M Sport Auto is above average for reliability based on real UK MOT data. Here's everything you need to know before buying a used BMW 420I M Sport Auto.
BMW 420I M Sport Auto Number Plates
Number plates registered to a BMW 420I M Sport Auto. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
BMW 420I M Sport Auto MOT Pass Rate by Year
How likely is a BMW 420I M Sport Auto to pass its MOT? Here's the pass rate for each registration year, newest first.
BMW 420I M Sport Auto Common Faults & Problems
These are the most common serious faults found on BMW 420I M Sport Auto models during MOT testing — flagged as dangerous or major failures that need immediate attention.
BMW 420I M Sport Auto Mileage — What's Normal?
How many miles does a typical BMW 420I M Sport Auto owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
BMW 420I M Sport Auto MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the BMW 420I M Sport Auto year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2023 | 1,183 | 90.5% | 16,973 | 23,569 | 31,442 |
| 2022 | 5,008 | 89.5% | 17,379 | 24,440 | 33,766 |
| 2021 | 7,629 | 89.7% | 18,950 | 26,773 | 36,911 |
| 2020 | 951 | 91.1% | 19,936 | 27,727 | 39,074 |
How Long Does a BMW 420I M Sport Auto Last?
Based on 7,627 BMW 420I M Sport Auto vehicles on UK roads.
BMW 420I M Sport Auto Mileage Distribution
Total mileage recorded across all BMW 420I M Sport Auto 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 420I M Sport Auto
Based on MOT pass rates across all registration years with sufficient test data.
91.1% MOT pass rate from 951 tests
89.5% MOT pass rate from 5,008 tests
The best year to buy a used BMW 420I M Sport Auto is 2020, which has the highest MOT pass rate at 91.1% across 951 tests. The 2022 model year has the lowest pass rate at 89.5% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the BMW 420I M Sport Auto Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| BMW 420I M Sport Auto THIS CAR | 89.9% | 15,587 | 26,042 mi | — 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 |
| Fiat Punto S 60 | 61.7% | 23,120 | 70,351 mi | 29 yrs |
Compared to the BMW 3 Series (75.1% pass rate) and the BMW 118 (81.5% pass rate), the BMW 420I M Sport Auto outperforms both on MOT reliability.
Found a BMW 420I M Sport Auto 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 420I M Sport AutoShould you buy a used BMW 420I M Sport Auto?
The BMW 420I M Sport Auto has an overall MOT pass rate of 89.9% across 15,587 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
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 420I M Sport Auto 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 420I M Sport Auto owner drives around 6,639 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.
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.