The MOT Files

Known faults, from the test record

BMW 7 Series common problems

What fails on the BMW 7 Series at MOT, which parts are behind it, and how each model year compares. From 18,523 DVSA test records.

Data updated

Quick answer

The BMW 7 Series's most common MOT problems are tyres, suspension bushes, wiper blades and washers, recorded in 42.7%, 40.1% and 14.3% of failed tests respectively. By model year, 2021 cars pass most often (91.4%) and 2017 cars least (88.4%), though most of that gap is age. Every figure here is what testers recorded, not what owners reported.

A “common problems” list is usually a forum thread: whoever had the worst day writes the longest post. This one is built the other way, from every BMW 7 Series that took an MOT last year and what the tester wrote down. It cannot see breakdowns, electrical gremlins or a gearbox that hunts, because the test does not check those. What it can see, it sees across 18,523 cars.

By component

What wears out on a 7 Series

Failure items grouped by the part behind them, with the share of failed BMW 7 Series tests recording each. A part can carry several DVSA wordings; they are listed beneath. One failed test often lists several items, so shares do not sum to 100%.

  1. 1.Tyres

    42.7% of failed tests

    Tread wears with every mile and sidewalls age and take kerb damage; the legal minimum is 1.6 mm across the central three-quarters.

    • “Tyre tread depth not in accordance with the requirements” — explained12.8%
    • “A tyre cords visible or damaged” — explained10.9%
    • “A tyre seriously damaged” — explained10.2%
    • “A tyre seriously damaged” — explained4.4%

    Across all cars, tyres failures run at a similar rate at every age, because they are replaced on a cycle rather than wearing out with the car. How long tyres last

  2. 2.Suspension bushes

    40.1% of failed tests

    Rubber bushes in arms and links perish and split with age and load; the most recorded suspension item on the test.

    • “A suspension pin, bush or joint excessively worn” — explained15.1%
    • “A suspension pin, bush or joint excessively worn” — explained11.7%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained6.3%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained5.3%

    Across all cars, suspension bushes failures climb 20-fold between three and fifteen years, peaking at 15+ years. How long suspension bushes last

  3. 3.Wiper blades and washers

    14.3% of failed tests

    Rubber blades harden and split within a year or two; washer jets block and pumps fail.

    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained5.7%
    • “Wiper blade missing or obviously not clearing the windscreen” — explained5.2%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained3.4%

    Across all cars, wiper blades and washers failures run at a similar rate at every age, because they are replaced on a cycle rather than wearing out with the car. How long wiper blades and washers last

  4. 4.Wheels and fixings

    11.5% of failed tests

    Rims crack or distort on potholes and kerbs; a missing or loose wheel nut is a fitting error rather than wear.

    • “Any fracture or welding defect on a wheel” — explained7.3%
    • “A wheel with a loose or missing wheel nut, bolt or stud” — explained4.2%

  5. 5.Coil springs

    10.4% of failed tests

    Springs fatigue and corrode where the coating chips, then snap, often at the bottom coil; potholes and salt accelerate it.

    • “A spring or spring component fractured or seriously weakened” — explained10.4%

    Across all cars, coil springs failures climb 20-fold between three and fifteen years, peaking at 12–14 years. How long coil springs last

  6. 6.Bulbs and lamps

    10.3% of failed tests

    Filament bulbs simply expire; the cheapest and most avoidable failure on the test, and one of the most recorded.

    • “A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained5.4%
    • “A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained2.9%
    • “A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED” — explained2.0%

    Across all cars, bulbs and lamps failures climb 15-fold between three and fifteen years, peaking at 15+ years. How long bulbs and lamps last

  7. 7.Parking brake

    8.8% of failed tests

    Cables stretch and seize, rear shoes and adjusters wear; efficiency is measured on the roller tester against the vehicle's weight.

    • “Parking brake efficiency below minimum requirement” — explained5.2%
    • “Parking brake efficiency less than 50% of the required value” — explained2.3%
    • “Parking brake inoperative on one side” — explained1.3%

  8. 8.Engine management

    6.1% of failed tests

    The MIL lamp lit is a failure in itself, whatever the stored code; the fault codes section explains what lies behind it.

    • “Engine MIL illuminated indicating a malfunction” — explained3.1%
    • “Engine MIL illuminated indicating a malfunction” — explained3.0%

By registration year

7 Series problems by year

MOT pass rate for BMW 7 Series cars by the year they were first registered, from years with at least 1,000 tests. Every car in a row is the same age, so the rate is raw. Neighbouring years differ by a year of wear — a step of a point or two is age. No single step here is large enough to point at a generation change.

201689%
201788%−1.0
201890%+1.6
201991%+1.3
202191%+0.1

Last column: change on the previous year, in points. Years registered within the last three years have not yet been tested and are not shown.

Before it fails

What testers warn 7 Series owners about

Advisories are the same parts a year or two earlier. Share of all BMW 7 Series tests carrying an advisory for each.

Go deeper

The rest of the 7 Series file

Common questions

What are the most common problems with a BMW 7 Series?
Going by what fails the MOT, tyres (recorded in 42.7% of failed tests), suspension bushes (recorded in 40.1% of failed tests), and wiper blades and washers (recorded in 14.3% of failed tests). These are the items testers actually record across 18,523 tests, not reports from owners, so they describe what goes wrong at the point where it has to be fixed.
Which BMW 7 Series year is the most reliable?
By MOT pass rate, BMW 7 Series cars registered in 2021 do best at 91.4% and 2017 cars do worst at 88.4%. Most of that ordering is simply age — newer cars pass more — so read the year table for steps larger than a couple of points between neighbouring years; those mark a change in the cars rather than the calendar.
Is the BMW 7 Series reliable?
Adjusted for the age and mileage of the cars tested, the BMW 7 Series passes 85.6% of MOTs against a national 72.3%. An MOT measures roadworthiness on the day rather than breakdowns or running costs, so this is a reliability measure in the narrow sense: how often the car meets the legal standard, and what stops it.
What should I check when buying a used BMW 7 Series?
Start with what fails most: tyres, suspension bushes, wiper blades and washers. Then read the car's own MOT history for advisories carried year to year without repair — the model tells you what to expect, the history tells you whether this owner dealt with it.

Analysis built from DVSA data of