The MOT Files

Known faults, from the test record

Porsche Taycan common problems

What fails on the Porsche Taycan at MOT, which parts are behind it, and how each model year compares. From 7,988 DVSA test records.

Data updated

Quick answer

The Porsche Taycan's most common MOT problems are tyres, registration plates, bulbs and lamps, recorded in 100.0%, 12.7% and 4.8% of failed tests respectively. By model year, 2021 cars pass most often (91.6%) and 2020 cars least (90.7%), 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 Porsche Taycan 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 7,988 cars.

By component

What wears out on a Taycan

Failure items grouped by the part behind them, with the share of failed Porsche Taycan 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

    100.0% 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.

    • “A tyre cords visible or damaged” — explained41.5%
    • “A tyre seriously damaged” — explained30.6%
    • “Tyre tread depth not in accordance with the requirements” — explained20.1%
    • “A tyre seriously damaged” — explained15.0%

    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.Registration plates

    12.7% of failed tests

    Plates fade, crack and delaminate; non-standard fonts and spacing fail regardless of condition.

    • “Number plate does not conform to the specified requirements” — explained11.3%
    • “Number plate showing an incorrect registration” — explained0.8%
    • “Number plate inscription missing or illegible” — explained0.6%

  3. 3.Bulbs and lamps

    4.8% of failed tests

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

    • “An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained1.7%
    • “A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED” — explained1.1%
    • “A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained0.9%
    • “Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained0.5%

    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.Headlamp aim

    4.0% 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” — explained3.1%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained0.6%
    • “Headlamp aim unable to be tested” — explained0.3%

  5. 5.Wiper blades and washers

    2.9% 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” — explained1.2%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained1.2%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained0.5%

    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.Suspension bushes

    2.8% 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” — explained2.2%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained0.3%
    • “A suspension pin, bush or joint excessively worn” — explained0.3%

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

  7. 7.Wheels and fixings

    2.2% 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” — explained1.9%
    • “A wheel badly distorted or wear between wheel and hub at spigot mounting” — explained0.3%

  8. 8.Tyre pressure sensors

    2.0% of failed tests

    Valve-mounted sensors have sealed batteries that expire after roughly seven to ten years; a system fault lamp is a failure on cars first used from 2012.

    • “A tyre pressure monitoring system malfunctioning or obviously inoperative” — explained2.0%

By registration year

Taycan problems by year

MOT pass rate for Porsche Taycan 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.

202091%
202192%+0.9
202291%−0.6

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 Taycan owners about

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

Go deeper

The rest of the Taycan file

Common questions

What are the most common problems with a Porsche Taycan?
Going by what fails the MOT, tyres (recorded in 100.0% of failed tests), registration plates (recorded in 12.7% of failed tests), and bulbs and lamps (recorded in 4.8% of failed tests). These are the items testers actually record across 7,988 tests, not reports from owners, so they describe what goes wrong at the point where it has to be fixed.
Which Porsche Taycan year is the most reliable?
By MOT pass rate, Porsche Taycan cars registered in 2021 do best at 91.6% and 2020 cars do worst at 90.7%. 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 Porsche Taycan reliable?
The Porsche Taycan passes 91.0% of MOTs unadjusted; its fleet is too narrow in age or mileage for a fair national comparison. 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 Porsche Taycan?
Start with what fails most: tyres, bulbs and lamps, 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