Supercharger Belt Failure

The belt driving the supercharger can degrade over time, leading to a loss of boost and power. This is a common wear item on supercharged engines. Estimated repair cost: $400 - $700.

The Positive Crankcase Ventilation (PCV) valve system can fail, leading to oil leaks and rough idling. This system manages crankcase pressure. Estimated repair cost: $300 - $600.

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2015 Audi S4 Maintenance guide

Name: Maintenance dataset for 2015 Audi S4
Creator: Carfocal

v1.0Updated Jun 2, 2026Ryan Davis4 Sources Analyzed1 Critical Recalls

MAINTENANCE SUMMARY

The 2015 Audi S4 presents an average reliability picture, marked by a significant number of Technical Service Bulletins (TSBs) and one critical safety recall concerning the airbag system. Owners should prioritize verifying the airbag recall completion and be aware of potential issues related to the high TSB volume, which suggests a need for proactive inspection across various systems.

View Critical Issue: Oil Leaks (Valve Covers, Oil Cooler)

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Reliability Score

Est. Annual Maintenance Cost

$600 - $1,000

TSBs & Recalls

344 TSBs | 1 Recalls

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Key Takeaways

Proactive maintenance is key due to a high TSB count.
Verify completion of the airbag system recall.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance