Is the 2015 AUDI S4 reliable?

Excellent reliability. Very few MOT failures. 92% of AUDI S4s from 2015 passed their MOT first time in 2026, based on 39 tests. That's 10 points above the national average of 82%.

How much does a 2015 AUDI S4 cost to run?

Estimated annual running cost is £2,277 (£190/month), including £1592 fuel, £430 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2015 AUDI S4?

The 2015 AUDI S4 has a 92% MOT pass rate based on 39 tests in 2026. This ranks 127 out of 559 cars from 2015.

Which year AUDI S4 is most reliable?

The 2013 AUDI S4 has the highest MOT pass rate at 94%. The least reliable year is 2006 at 78%.

What is the average mileage for a 2015 AUDI S4?

The average mileage for a 2015 AUDI S4 is 65,685 miles, which is in line with the expected 81,400 miles for a 11-year-old car, suggesting normal everyday use.

AUDI S4 (2015)

Running costs, reliability data, and common problems from 39 real MOT tests.

Annual Cost

£2,277

£190/month

MOT Pass Rate

92%

Excellent

Road Tax

£430

Based on CC/year

Insurance

Grp 30-42

2995cc Petrol

Great Choice

92% pass rate, £2277/year to run. 10 points above average.

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Petrol2995cc11 years old39 tests66k miles avg

Annual Running Costs

Fuel (Petrol, 2995cc)

~30 mpg

£1,592

Road Tax

Based on 2995cc

£430

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,277

Per month£190/mo

Per week£44/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

92% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%.

At 11 years old, 92% of AUDI S4s from 2015 passed their MOT first time in 2026. That's based on 39 tests across the UK. The average mileage at this age is 65,685 miles.

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How Does It Compare?

Rank among 2015 cars127th of 559(top 23%)

Rank among AUDI models582th of 1,079(top 54%)

vs national average+10%(82% avg)

vs 2015 cars average+9%(83% avg)

vs AUDI average+2%(90% avg)

Mileage Analysis

65,685

Average miles

81,400

Expected for age

The average 2015 AUDI S4 has 65,685 miles on the clock, which is in line with the expected 81,400 miles for a 11-year-old car, suggesting normal everyday use.

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Best Year to Buy?

The most reliable year is the 2013 model with a 94% MOT pass rate, while the 2006 model has the lowest at 78%. The 2015 sits between the two at 92%.

AUDI S4 by Year

Year	Pass Rate	Tests	Avg Mileage
2017	94%	69	57,456 mi
2015	92%	39	65,685 mi
2014	86%	170	83,424 mi
2013	94%	189	90,972 mi
2012	92%	78	82,804 mi
2011	87%	277	94,642 mi
2010	90%	277	101,140 mi
2009	91%	216	92,422 mi
2007	82%	126	83,877 mi
2006	78%	263	110,513 mi
2005	80%	169	99,307 mi
2004	81%	202	99,762 mi
2000	85%	59	152,811 mi
1999	85%	142	161,691 mi

Similar Cars to Consider

BMW 3 SERIES

2014 · 3000cc Petrol

£2,247/year

87%

-5%

VAUXHALL INSIGNIA

2013 · 2792cc Petrol

£2,397/year

79%

-13%

BMW 1 SERIES

2013 · 2979cc Petrol

£2,247/year

84%

-8%

LAND ROVER RANGE ROVER SPORT

2016 · 2995cc Petrol

£2,247/year

89%

-3%

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About the 2015 AUDI S4

The 2015 AUDI S4 is a premium performance with a 2995cc petrol engine. 39 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 23% of all 2015 cars for reliability.

With an average of 65,685 miles at 11 years old, AUDI S4 owners drive about as much as the UK average.

2015 AUDI S4 Fuel Costs

The 2995cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 2015 AUDI S4?

Total estimated annual running cost is £2,277 (£190/month), broken down as £1592 fuel, £430 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

AUDI S4 Reliability Trend

Newer AUDI S4s show better MOT pass rates than older ones, with an average improvement of 9 percentage points.

Buying a Used 2015 AUDI S4

At 11 years old, the AUDI S4 is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2013 model has the highest pass rate at 94%. Note: with only 39 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 2015 AUDI S4's fuel type, age, and engine size, these are the most likely problem areas to check.

Timing Chain / Belt

Watch out

At 11 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Medium risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2015 AUDI S4 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
AUDI S4(2015)	92%	£1592	£430	Grp 30-42	£2277
BMW 3 SERIES(2014)	87%	£1592	£250	Grp 30-42	£2247-£30
VAUXHALL INSIGNIA(2013)	79%	£1592	£250	Grp 30-42	£2397+£120
BMW 1 SERIES(2013)	84%	£1592	£250	Grp 30-42	£2247-£30
LAND ROVER RANGE ROVER SPORT(2016)	89%	£1592	£250	Grp 30-42	£2247-£30

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.