BMW 840i Auto (2021)
2021 BMW 840i Auto
CarHunch analysed 133 real MOT records for the 2021 BMW 840i Auto. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2021 BMW 840i is performing better than average on its MOT, with an 88.2% first-time pass rate well above the UK's 80%, though nearly a quarter of examples (24.8%) have experienced dangerous defects—a higher-than-typical concern that buyers should factor into their decision. The petrol engine variant maintains a solid 87.7% pass rate, so fuel type isn't a reliability dividing line here.
At just under 27,000 miles median—right on track for a three-year-old car—these 840is are showing modest failure rates of 0.38 per vehicle, suggesting most get through their early MOTs relatively unscathed. However, the average 1.1 advisories per test hints at minor wear accumulating, so have a pre-purchase inspection focus on brake condition and suspension components before committing.
What to check before buying a 2021 BMW 840i Auto
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- ⚠️ 24.8% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a BMW 840i Auto
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (96%) | 128 | 87.7% | 0.39 |
| Other (4%) | 5 | 100% | 0 |
Mileage Distribution
Most 2021 BMW 840i Auto vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2021 BMW 840i Auto vehicles fall between 18,782 and 36,226 miles.
2021 BMW 840i Auto — Still on the Road
Strong survival — 127 vehicles still getting MOTs in 2025, 100% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.
MOT History Averages
Found a specific BMW 840i Auto?
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