The MOT Files

Known faults, from the test record

Fiat Doblo common problems

What fails on the Fiat Doblo at MOT, which parts are behind it, and how each model year compares. From 41,092 DVSA test records.

Data updated

Quick answer

The Fiat Doblo's most common MOT problems are tyres, suspension bushes, bulbs and lamps, recorded in 29.1%, 28.6% and 25.6% of failed tests respectively. By model year, 2021 cars pass most often (74.1%) and 2006 cars least (53.0%), 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 Fiat Doblo 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 41,092 cars.

By component

What wears out on a Doblo

Failure items grouped by the part behind them, with the share of failed Fiat Doblo 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

    29.1% 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” — explained10.9%
    • “A tyre cords visible or damaged” — explained9.4%
    • “A tyre seriously damaged” — explained6.2%
    • “A tyre seriously damaged” — explained2.7%

    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

    28.6% 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” — explained8.8%
    • “A suspension pin, bush or joint excessively worn” — explained5.4%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained5.0%
    • “A suspension pin, bush or joint excessively worn” — explained4.4%

    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.Bulbs and lamps

    25.6% 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” — explained6.1%
    • “Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained5.4%
    • “A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED” — explained5.1%
    • “Lamp emitted colour, position or intensity not in accordance with the requirements” — explained3.6%

    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

  4. 4.Coil springs

    20.9% 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” — explained20.9%

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

  5. 5.Wiper blades and washers

    14.6% of failed tests

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

    • “Wiper blade missing or obviously not clearing the windscreen” — explained8.0%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained4.1%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained2.5%

    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

  6. 6.Headlamp aim

    11.7% of failed tests

    Aim drifts with sagging suspension, a knocked lamp or a botched bulb change; adjustment, not a part.

    • “The aim of a headlamp is not within limits laid down in the requirements” — explained9.0%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained2.7%

  7. 7.Engine management

    10.4% 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” — explained7.2%
    • “Engine MIL illuminated indicating a malfunction” — explained3.1%

  8. 8.Shock absorbers

    7.8% of failed tests

    Seals wear and the damper leaks fluid or loses its action; failure is for a leak or no damping, not for being tired.

    • “A shock absorber damaged to the extent that it does not function or showing signs of severe leakage” — explained4.0%
    • “A shock absorber bush excessively worn” — explained3.7%

    Across all cars, shock absorbers failures climb 7-fold between three and fifteen years, peaking at 15+ years. How long shock absorbers last

By registration year

Doblo problems by year

MOT pass rate for Fiat Doblo 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. The step at 2013, up 12.9 points, is larger than wear explains and most likely marks a change in the cars themselves.

200653%
200753%+0.4
200857%+3.1
200962%+5.1
201059%−3.0
201156%−2.1
201258%+1.9
201371%+12.9
201460%−11.0
201563%+2.5
201664%+0.9
201766%+2.4
201871%+4.8
201971%−0.2
202070%−1.1
202174%+4.4

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 Doblo owners about

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

Go deeper

The rest of the Doblo file

Common questions

What are the most common problems with a Fiat Doblo?
Going by what fails the MOT, tyres (recorded in 29.1% of failed tests), suspension bushes (recorded in 28.6% of failed tests), and bulbs and lamps (recorded in 25.6% of failed tests). These are the items testers actually record across 41,092 tests, not reports from owners, so they describe what goes wrong at the point where it has to be fixed.
Which Fiat Doblo year is the most reliable?
By MOT pass rate, Fiat Doblo cars registered in 2021 do best at 74.1% and 2006 cars do worst at 53.0%. 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. The largest such step is at 2013, up 12.9 points on 2012.
Is the Fiat Doblo reliable?
Adjusted for the age and mileage of the cars tested, the Fiat Doblo passes 65.4% 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 Fiat Doblo?
Start with what fails most: tyres, suspension bushes, bulbs and lamps. 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