The MOT Files

Known faults, from the test record

Citroen C4 Cactus common problems

What fails on the Citroen C4 Cactus at MOT, which parts are behind it, and how each model year compares. From 21,184 DVSA test records.

Data updated

Quick answer

The Citroen C4 Cactus's most common MOT problems are tyres, wiper blades and washers, bulbs and lamps, recorded in 32.4%, 28.8% and 27.8% of failed tests respectively. By model year, 2020 cars pass most often (81.5%) and 2016 cars least (62.4%), 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 Citroen C4 Cactus 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 21,184 cars.

By component

What wears out on a C4 Cactus

Failure items grouped by the part behind them, with the share of failed Citroen C4 Cactus 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

    32.4% 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” — explained15.7%
    • “A tyre cords visible or damaged” — explained6.3%
    • “A tyre seriously damaged” — explained6.0%
    • “A tyre seriously damaged” — explained2.6%

    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.Wiper blades and washers

    28.8% 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” — explained20.6%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained5.7%
    • “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

  3. 3.Bulbs and lamps

    27.8% of failed tests

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

    • “A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED” — explained9.1%
    • “A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps” — explained7.1%
    • “Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained6.2%
    • “A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained2.3%

    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.Driveshaft gaiters

    17.2% of failed tests

    The rubber boot over each CV joint splits with age and flexing, then throws grease and lets grit destroy the joint.

    • “A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc” — explained17.2%

    Across all cars, driveshaft gaiters failures climb 21-fold between three and fifteen years, peaking at 15+ years. How long driveshaft gaiters last

  5. 5.Suspension bushes

    14.3% 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” — explained10.2%
    • “A suspension pin, bush or joint excessively worn” — explained3.2%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained1.0%

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

  6. 6.Headlamp aim

    11.1% 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” — explained4.1%
    • “Headlamp aim unable to be tested” — explained3.1%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained2.6%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained1.4%

  7. 7.Exhaust system

    9.0% of failed tests

    Silencers and pipes rust through from the inside on short-trip cars; rubber hangers perish.

    • “Exhaust system leaking or insecure” — explained6.0%
    • “Exhaust system leaking or insecure” — explained3.0%

    Across all cars, exhaust system failures climb 104-fold between three and fifteen years, peaking at 15+ years. How long exhaust system last

  8. 8.Brake discs

    8.8% of failed tests

    Discs thin with each pad set and pit or corrode when lightly used; failure is for significant wear, fracture or insecurity, advisory for surface condition.

    • “Brake disc or drum significantly and obviously worn” — explained5.9%
    • “Excessive fluctuation in brake effort through each wheel revolution.” — explained1.5%
    • “Brake disc or drum excessively weakened, insecure or fractured” — explained1.4%

    Across all cars, brake discs failures climb 3-fold between three and fifteen years, peaking at 12–14 years. How long brake discs last

By registration year

C4 Cactus problems by year

MOT pass rate for Citroen C4 Cactus 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 2020, up 6.5 points, is larger than wear explains and most likely marks a change in the cars themselves.

201662%
201766%+3.8
201871%+5.0
201975%+3.8
202081%+6.5

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 C4 Cactus owners about

Advisories are the same parts a year or two earlier. Share of all Citroen C4 Cactus tests carrying an advisory for each.

Go deeper

The rest of the C4 Cactus file

Common questions

What are the most common problems with a Citroen C4 Cactus?
Going by what fails the MOT, tyres (recorded in 32.4% of failed tests), wiper blades and washers (recorded in 28.8% of failed tests), and bulbs and lamps (recorded in 27.8% of failed tests). These are the items testers actually record across 21,184 tests, not reports from owners, so they describe what goes wrong at the point where it has to be fixed.
Which Citroen C4 Cactus year is the most reliable?
By MOT pass rate, Citroen C4 Cactus cars registered in 2020 do best at 81.5% and 2016 cars do worst at 62.4%. 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. The largest such step is at 2020, up 6.5 points on 2019.
Is the Citroen C4 Cactus reliable?
Adjusted for the age and mileage of the cars tested, the Citroen C4 Cactus passes 69.0% 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 Citroen C4 Cactus?
Start with what fails most: tyres, wiper blades and washers, 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