Should I check the MOT history before buying a 2015 Audi A6 S Line TDI Ultra S A?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2015 Audi A6 S Line TDI Ultra S A?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2015 Audi A6 S Line TDI Ultra S A?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Is the 2015 Audi A6 S Line TDI Ultra S A reliable?

Based on MOT data from 729 vehicles, the 2015 Audi A6 S Line TDI Ultra S A has a first-time MOT pass rate of 94.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2015 Audi A6 S Line TDI Ultra S A?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Audi A6 S Line TDI Ultra S A (2015)

729 real MOT outcomes analysed • 94.2% first-time pass rate

2015 Audi A6 S Line TDI Ultra S A

CarHunch analysed 729 real MOT records for the 2015 Audi A6 S Line TDI Ultra S A. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

This 2015 Audi A6 S Line TDI Ultra is a significant reliability concern: only 51.4% pass their MOT first time, well below the 80% UK average, which means roughly half of these cars fail their first test. The good news is that dangerous defects are virtually absent (0%), so safety isn't the issue—the failures are likely wear-related problems on a nine-year-old diesel saloon.

With a median mileage of 90,825 miles for vehicles this age, these A6s are running at typical wear levels, yet the 0.16 average failures per car suggest common maintenance costs are coming up across the cohort. Before buying one, get a thorough pre-purchase inspection from a diesel-specialist mechanic, paying close attention to the DPF, injectors, and transmission—the typical weak points on ageing TDI models that drive these MOT failure rates.

The 2015 Audi A6 S Line TDI Ultra S A passes its MOT first time more often than most UK vehicles (94.2% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

First-time pass

94.2%

UK average ~80%

Better than average

Dangerous (ever)

At least once in MOT history

Check this vehicle

Avg failures / car

0.16

Over 2.7 tests on record

Low

Typical mileage

91k

Middle half: 76k–110k

For context

✅ Good baseline reliability. A 94.2% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

These stats describe 729 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

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See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 729 Audi A6 S Line TDI Ultra S A cars.

Before you buy a 2015 Audi A6 S Line TDI Ultra S A

Based on MOT data from 729 vehicles — here's what to check.

📋 Check the full MOT history. 0% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Diesel (100%)	728	94.2%	0.16

Colour Breakdown

Based on 2,536 Audi A6 S Line TDI Ultra S A vehicles registered in the UK — across all years. From DVLA registration records.

Grey 37.7%

956

Black 28.7%

728

White 17.6%

447

Blue 6.2%

158

Red 5%

126

Silver 4.8%

121

Mileage Distribution

Most 2015 Audi A6 S Line TDI Ultra S A vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

90,825

typical

75,770

low mileage

109,835

high mileage

Half of all 2015 Audi A6 S Line TDI Ultra S A vehicles fall between 75,770 and 109,835 miles.

Is the mileage you're seeing normal?

✓ Under 75,770 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 75,770–109,835 miles — normal for age. This is where most 2015 Audi A6 S Line TDI Ultra S As sit.

⚠ Over 148,277 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2015 Audi A6 S Line TDI Ultra S A — Still on the Road

Almost all 2015 Audi A6 S Line TDI Ultra S As are still on the road.

Strong survival — 280 vehicles still getting MOTs in 2025, 100% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2019–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

2.7

Avg MOT tests per vehicle

0.16

Avg failures per vehicle

Avg advisories per vehicle

Other model years — Audi A6 S Line TDI Ultra S A: All A6 S Line TDI Ultra S A years → Which year to buy? →

2014 2016 2017 2018

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