Model Reports 5 min read Updated 18 Oct 2026

Audi A5 2015: reliability & common MOT faults

In 2025, 78 in every 100 first MOTs on a 2015 Audi A5 were passes. Most common reason for a fail: Tyre condition (front).

Summary

The 2015 Audi A5 follows the pattern of the model years either side.

At a glance

How 9,804 first tests went in 2025.

Passed first time
78 in every 100
Did not pass first time
22 in every 1002,178 failed first-attempt tests
The typical car
10 yearsabout 86,135 miles
First tests counted
9,804

What failed most often

  1. Tyre condition (front)17 in every 100 failed tests
  2. Tyre tread depth (front)11 in every 100 failed tests
  3. Shock absorbers (rear)10 in every 100 failed tests

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2015 Audi A5 vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Suspension

Two faults. The strongest is the shock absorbers (rear): 4.9 times as often as on similar cars.

Figures below are measured across the 2,177 of 2,178 failed first attempts that recorded an odometer reading in 2025. Mileage is needed to compare like with like.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Shock absorbers (rear)

Failed on 224 first tests4.9 times as often as similar carsLikely evidence

What it means

Slight seepage that leaves a film of fluid on a shock absorber does not fail it. Severe leakage, or damage so that it does not function, is Major. A shock absorber missing or likely to become detached is graded Dangerous, though a missing one is only rejected if shock absorbers were fitted as standard.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 220 first tests, 4.0 times as often as on similar cars.

Suspension arm pins and bushes (front)

Failed on 203 first tests2.1 times as often as similar carsPossible evidence

What it means

Pins and bushes on suspension arms fail as Major when they are excessively worn. They are graded Dangerous when likely to become detached. DVSA uses the same wording for a suspension joint.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 370 first tests, 2.3 times as often as on similar cars.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage. Advisories count notes recorded on failed first tests only.

Tyres

Two wear patterns. The strongest is the tyre condition (front): 2.4 times as often as on similar cars.

Tyre condition (front)

Failed on 378 first tests2.4 times as often as similar carsWear pattern

What it means

Exposed or damaged ply or cords are graded Dangerous. A cut in excess of the requirements and deep enough to reach the ply or cords is Major, and testers may open the cut with a blunt instrument to check its depth. A tyre contacting the vehicle through flexing or suspension movement is not a defect; fouling fails only at the time of test.

Tyre condition (rear)

Failed on 292 first tests2.2 times as often as similar carsWear pattern

What it means

Exposed or damaged ply or cords are graded Dangerous. A cut in excess of the requirements and deep enough to reach the ply or cords is Major, and testers may open the cut with a blunt instrument to check its depth. A tyre contacting the vehicle through flexing or suspension movement is not a defect; fouling fails only at the time of test.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

Body and structure

One fault: drive shaft joints and boots (front), 2.1 times as often as on similar cars.

Drive shaft joints and boots (front)

Failed on 183 first tests2.1 times as often as similar carsPossible evidence

What it means

A constant velocity boot that is only severely deteriorated is Minor. It is Major once it is missing, split or insecure so that it no longer prevents the ingress of dirt. A transmission joint excessively worn is Major, and graded Dangerous when it is so worn it is likely to fail.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

Advisories

Other things testers noted as worn or close to failing, more often than on similar cars.

An advisory is a note from the tester about something that has not failed yet. It is an early warning, not a fail. Advisories for the faults above are shown with those faults.

Suspension sub-frame (rear)

Noted on 88 first tests3.0 times as often as similar carsElevated evidence

Data: UK MOT open data, 2025. Counts cover advisories recorded on failed first tests only, compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time
78in every 100
Passed on the first test.
Fixed at the station
3in every 100
Failed, then fixed at the test station the same day.
Failed
19in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 77.8% of 9,804 first tests (2025): only cars that passed first time count. Official-style pass 80.9%: cars fixed at the test station also count as a pass. The 3 fixed and the 19 not fixed make the 22 in every 100 that did not pass first time.

Petrol and diesel

First testsTypical mileagePassed first time, as testedPassed first time, same mileage
Diesel7,18493,143 miles7677
Petrol2,61968,778 miles8382

Figures are in every 100 first tests. Cars with more miles usually fail more often, so the same-mileage figure gives every fuel the mileage mix of all the cars in this year.

Same model, other years

Passed first time in every 100, all tested in 2025.

406080100201020152020Older carsNewer cars
406080100201020152020Older carsNewer cars

Newer cars are younger, so look for a jump rather than the climb.

YearPassed first timeFirst tests
200771 in every 1001,115
200868 in every 1003,279
200970 in every 1005,098
201069 in every 1008,998
201170 in every 1008,786
201273 in every 1008,576
201374 in every 1009,981
201476 in every 10010,081
2015 This car78 in every 1009,804
201678 in every 1007,930
201780 in every 10013,186
201881 in every 10010,837
201984 in every 1009,390
202087 in every 1004,584
202188 in every 1005,045
202289 in every 1004,172

If you are buying one

What this year's MOT record means for the decision in front of you.

Mileage matters most on a 2015 Audi A5.

Of 2015 Audi A5 vehicles with under 62,000 miles, 84 in every 100 passed their 2025 MOT first time. With 116,000 miles or more, 73 in every 100 did.

Under 62,0001,978 tests
84
62,000–78,0001,905 tests
81
78,000–94,000 Typical car1,967 tests
77
94,000–116,0001,999 tests
73
116,000 and over1,954 tests
73

Petrol or diesel?

Typical mileagePassed first time,
as tested		Passed first time,
same mileage
Diesel93,143 miles7677
Petrol68,778 miles8382

Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 93,143 against 68,778). At the same mileage there is no clear difference between the two.

What to check at your mileage

How often each fault turned up on a failed first test, by the car's mileage. Read it as: what is likely to need looking at on a car like the one in front of you.

Under 62,00078,000–94,000116,000 and over
Tyre condition (front)3.24.53.4
Tyre tread depth (front)1.53.03.3
Shock absorbers (rear)0.73.02.8
Suspension arm pins and bushes (front)1.12.32.6
Drive shaft joints and boots (front)0.71.73.1

Faults per 100 first tests, by the car's mileage at the test.

When a car fails

43in every 100

of failed cars had one item to fix.

27in every 100

of failed cars had three or more items to fix.

9in every 100

of all first tests had a defect the tester marked dangerous (unsafe to drive away).

Every figure here is a first-attempt MOT rate from DVSA open data for this model line, for cars of this model year tested in 2025. Each mileage band holds a fifth of the tests. MOTs do not test engine or gearbox internals, so this is a pre-purchase checklist, not a full reliability score.

FAQs

Short answers about how to read this model-year guide.

The 2015 Audi A5 follows the pattern of the model years either side. Its main cause of failure was Tyre condition (front), about 17 in every 100 failed tests. In 2025, 77.8% of 9,804 first MOTs on the 2015 Audi A5 passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 80.9%. Among 2,178 failed first-attempt MOT tests (test year 2025), Shock absorbers (rear) appears more often than on similar cars (10.3% of those tests; 224 observed failures; about 4.9× more often than similar cars). There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.
Ranked by how often they were actually recorded, the items that most often failed a 2015 Audi A5 at the first attempt were Tyre condition (front) (17.4%), Tyre tread depth (front) (11.3%) and Shock absorbers (rear) (10.3%), each as a share of the year's failed first attempts. That is what goes wrong most often on the car. The common faults table shows a different measure: faults that are unusual compared with similar cars.
Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: Shock absorbers (rear) (10.3% of those tests; 224 observed failures; about 4.9× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Shock absorbers (rear) shows up more often than on similar cars (10.3% of those tests; 224 observed failures; about 4.9× more often than similar cars). That does not prove a design fault. Age, mileage, and how the car was used still matter. Treat it as a pre-purchase checkpoint, not a manufacturer service bulletin.
Common MOT problem areas for the 2015 Audi A5 include Shock absorbers (rear), Drive shaft joints and boots (front), Suspension arm pins and bushes (front). These are the faults that stand out compared with similar cars, not a complete list of what can go wrong on any individual car.
Advisories flag issues noted at the test and are not a fail rate. We show advisory patterns that appear more often than on similar cars among failed first-attempt tests, separate from common failure rows. Use them as early-warning checks, not as a pass/fail score.
This page highlights MOT failure patterns for the 2015 Audi A5 (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.
No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

  • MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
  • Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
  • Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
  • If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.

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