Reliability Report · Multi-Source Data

Audi A4 (2015–2017) Reliability

The Audi A4 (2015–2017) scores 75/100 on our composite reliability index — good territory — drawn from ADAC, DVSA, NHTSA data. The most-flagged failure mode is sunroof drain blockage + module corrosion, typically surfacing between 100,000 and 200,000 km. Workshop repair runs €400–€1,500. Estimated used prices span €10,800–€17,000.

Composite Score
75
/ 100
Good
Sources: ADAC · DVSA · NHTSA · latest 2026
Market Snapshot
Listed model years2015–2017
Est. used price€10,800–€17,000
Documented issues1
Listings in catalogue25
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Reliability by Source

Each independent organization measures reliability differently. TÜV reports inspection defect rates by age band. ADAC reports pan-European breakdowns per 1,000 vehicles. NHTSA aggregates US consumer complaints. DVSA MOT data is the UK fleet's annual safety inspection — every car 3+ years old. Lower variance across sources = higher confidence in the composite.

NHTSA (US Complaints)
Model years 2013–2019 · 2026 report · n=207
207 complaints across 5 sampled year(s); resolved model="A4"
View source ↗
66
/ 100
ADAC (European Auto Club)
All model years · 2025 report
4.0/1000 breakdowns
View source ↗
76
/ 100
DVSA MOT (UK Inspections)
Model years 2004–2021 · 2024 report · n=372477
372,477 UK MOT tests · overall 20.9% fail rate vs UK fleet baseline
View source ↗
80
/ 100
DVSA MOT (UK Inspections)
Model years 2003–2020 · 2023 report · n=244786
244,786 UK MOT tests · overall 23.6% fail rate vs UK fleet baseline
View source ↗
74
/ 100

UK MOT Reliability Detail

Based on 372,477 MOT tests in the UK during the 2024 reporting period. Score for each age band reflects this model's fail rate vs the UK-fleet baseline fail rate at the same age — a generation-aware metric.

Age 3–5 yrs
75
9.6% fail vs 10.9% fleet
35,239 tests
Age 6–9 yrs
78
15.5% fail vs 19.2% fleet
118,920 tests
Age 10–14 yrs
83
21.8% fail vs 32.1% fleet
112,903 tests
Age 15–20 yrs
79
30.0% fail vs 38.8% fleet
105,415 tests

Most Common MOT Failure Categories

#1
Joints
43,858
29.6%
#2
Condition
31,914
21.5%
#3
Ball joint dust cover
25,645
17.3%
#4
Windscreen
24,379
16.4%
#5
Tread depth
22,535
15.2%

Categories ranked across all MOT tests of this model in the UK during the 2024 period. "Condition" covers cosmetic / wear issues; suspension and braking dominate the rest.

Known Issues

Specific failure modes documented across European workshops, owner forums, and TSBs. Costs in EUR (and USD reference) reflect typical retail European labor + parts ranges — specialist shops at the low end, dealer pricing at the high end.

Sunroof drain blockage + module corrosion
Typical at 100,000–200,000 km
B7/B8 A4 sunroof drain water ingress damages the comfort-control module under the carpet (€600-1200 module + dry-out labour).
€400–€1,500medium

Compare Against Alternatives

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