Oil Leaks (PCV System)

The Positive Crankcase Ventilation (PCV) system can fail, leading to increased crankcase pressure and subsequent oil leaks from various seals and gaskets. This can manifest as oil consumption or visible oil residue. Estimated repair cost: $500 - $1,200.

Supercharger Belt Wear

The belt driving the supercharger can wear over time, leading to a loss of boost and reduced engine performance. Regular inspection is advised. Estimated repair cost: $200 - $400.

Carbon Buildup on Intake Valves

Direct-injection engines like the S4's 3.0L V6 are prone to carbon buildup on the intake valves, which can impede airflow and affect performance. This typically requires a specialized cleaning process. Estimated repair cost: $800 - $1,500.

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2014 Audi S4 Maintenance guide

Name: Maintenance dataset for 2014 Audi S4
Creator: Carfocal

v1.0Updated May 23, 2026Ryan Davis4 Sources Analyzed1 Critical Recalls

MAINTENANCE SUMMARY

The 2014 Audi S4 demands diligent maintenance, with a significant volume of TSBs (405) suggesting potential component-level issues. Key concerns include the airbag control module software and potential issues hinted at by the TSBs, such as engine management or electrical systems.

View Critical Issue: Airbag Control Module Software Defect

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Reliability Score

Est. Annual Maintenance Cost

$700 - $1,200

TSBs & Recalls

405 TSBs | 1 Recalls

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Key Takeaways

The 2014 Audi S4 has a 'Below Average' reliability verdict, influenced by a significant number of TSBs (405).
A critical airbag recall (14V667000) requires verification of a software update.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance