Model Reports 5 min read Updated 18 Oct 2026

Audi A4 2008: reliability & common MOT faults

In 2025, 62 in every 100 first MOTs on a 2008 Audi A4 were passes. Most common reason for a fail: Drive shaft joints and boots (front).

Summary

A 2008 Audi A4 passed first time about 2 in every 100 less often than the average of the 2007 and 2009 model years.

At a glance

How 12,492 first tests went in 2025.

Passed first time
62 in every 100
Did not pass first time
38 in every 1004,686 failed first-attempt tests
The typical car
17 yearsabout 138,734 miles
First tests counted
12,492

What failed most often

  1. Drive shaft joints and boots (front)16 in every 100 failed tests
  2. Headlight aim11 in every 100 failed tests
  3. Coil spring (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 2008 Audi A4 vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Suspension

Two faults. The strongest is the anti-roll bar linkage pins and bushes (front): 8.1 times as often as on similar cars.

Figures below are measured across the 4,679 of 4,686 failed first attempts (99.9%) 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.

Anti-roll bar linkage pins and bushes (front)

Failed on 133 first tests8.1 times as often as similar carsStrong evidence

What it means

Excessive wear in an anti-roll bar linkage pin or bush is Major. If the pin or bush is likely to become detached, it is graded Dangerous. The wording is DVSA's general one for a suspension pin, bush or joint.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 185 first tests, 7.3 times as often as on similar cars.

Coil spring (rear)

Failed on 445 first tests2.6 times as often as similar carsPossible evidence

What it means

A missing bump stop rubber is not a reason to fail a coil spring. When the vehicle is jacked and lowered, a spring that does not correctly locate as the suspension returns to its normal running position is rejected as insecurely attached. A missing spring is Major, and graded Dangerous where directional control is affected.

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

Brakes

One fault: flexible brake hoses (rear), 5.7 times as often as on similar cars.

Flexible brake hoses (rear)

Failed on 174 first tests5.7 times as often as similar carsStrong evidence

What it means

Testers reject a flexible brake hose for being excessively damaged or chafed only if it is severe enough to expose the reinforcement. Slight damage, chafing or twisting is graded Minor. A leak is graded Dangerous on a hydraulic braking system and Major on an air system, and a hose damaged and likely to fail is also Dangerous.

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

Noise, emissions and leaks

One fault: diesel engine warning light, 2.7 times as often as on similar cars.

Diesel engine warning light

Failed on 295 first tests2.7 times as often as similar carsPossible evidence

What it means

An engine malfunction indicator lamp that is illuminated to show a malfunction is graded Major on a diesel, but only on the diesels the test covers, which depends on the vehicle type and when it was first used. DVSA lists it under exhaust emissions for compression ignition engines, and the detail line for the row also names an inoperative lamp.

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), 2.2 times as often as on similar cars.

Drive shaft joints and boots (front)

Failed on 761 first tests2.2 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.

Diesel emissions test (pre-reg turbo rules before 01/07/2008)

Noted on 23 first tests3.1 times as often as similar carsElevated evidence

Suspension arm pins and bushes (front)

Noted on 1,143 first tests2.6 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
62in every 100
Passed on the first test.
Fixed at the station
7in every 100
Failed, then fixed at the test station the same day.
Failed
31in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 62.5% of 12,492 first tests (2025): only cars that passed first time count. Official-style pass 69.5%: cars fixed at the test station also count as a pass. The 7 fixed and the 31 not fixed make the 38 in every 100 that did not pass first time.

Petrol and diesel

First testsTypical mileagePassed first time, as testedPassed first time, same mileage
Diesel9,444147,659 miles6262
Petrol3,048109,336 miles6563

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.

40608010020002005200820152020Older carsNewer cars
406080100200020082020Older carsNewer cars

Newer cars are younger, so look for a jump rather than the climb. A year earlier (2024), when these cars were a year younger, 63 in every 100 passed first time.

YearPassed first timeFirst tests
199864 in every 100364
199962 in every 100591
200061 in every 100723
200163 in every 100659
200261 in every 1001,406
200361 in every 1002,678
200462 in every 1004,784
200562 in every 1005,426
200662 in every 1009,953
200764 in every 10011,899
2008 This car62 in every 10012,492
200964 in every 10010,978
201066 in every 10011,589
201168 in every 10012,652
201271 in every 10012,475
201372 in every 10015,094
201473 in every 10015,932
201574 in every 10015,482
201678 in every 10020,832
201779 in every 10020,081
201880 in every 10012,882
201984 in every 10012,510
202087 in every 1008,075
202188 in every 1006,782
202288 in every 1006,332

If you are buying one

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

Mileage matters most on a 2008 Audi A4.

Of 2008 Audi A4 vehicles with under 103,000 miles, 70 in every 100 passed their 2025 MOT first time. With 175,000 miles or more, 59 in every 100 did.

Under 103,0002,477 tests
70
103,000–128,0002,532 tests
62
128,000–149,000 Typical car2,432 tests
62
149,000–175,0002,563 tests
59
175,000 and over2,468 tests
59

Petrol or diesel?

Typical mileagePassed first time,
as tested		Passed first time,
same mileage
Diesel147,659 miles6262
Petrol109,336 miles6563

Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 147,659 against 109,336). 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 103,000128,000–149,000175,000 and over
Drive shaft joints and boots (front)3.16.87.8
Headlight aim2.54.74.1
Coil spring (rear)3.83.63.0
Tyre condition (rear)2.22.43.3
Suspension arm ball joint (front)1.42.83.9

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

When a car fails

27in every 100

of failed cars had one item to fix.

48in every 100

of failed cars had three or more items to fix.

10in 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.

A 2008 Audi A4 passed first time about 2 in every 100 less often than the average of the 2007 and 2009 model years. In 2025, 62.5% of 12,492 first MOTs on the 2008 Audi A4 passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 69.5%. Among 4,686 failed first-attempt MOT tests (test year 2025), Anti-roll bar linkage pins and bushes (front) appears more often than on similar cars (2.8% of those tests; 133 observed failures; about 8.1× 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 2008 Audi A4 at the first attempt were Drive shaft joints and boots (front) (16.3%), Headlight aim (10.7%) and Coil spring (rear) (9.5%), 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: Anti-roll bar linkage pins and bushes (front) (2.8% of those tests; 133 observed failures; about 8.1× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Anti-roll bar linkage pins and bushes (front) shows up more often than on similar cars (2.8% of those tests; 133 observed failures; about 8.1× 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 2008 Audi A4 include Anti-roll bar linkage pins and bushes (front), Flexible brake hoses (rear), Diesel engine warning light. 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 2008 Audi A4 (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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