Haldex All-Wheel Drive System Malfunctions

The Haldex system, responsible for distributing power to the rear wheels, can experience issues with its pump, filter, or clutch pack. Regular fluid changes are essential for longevity. Estimated repair cost: $1,000 - $3,000.

The Positive Crankcase Ventilation (PCV) valve can become clogged or fail, leading to increased oil consumption and potential vacuum leaks. This is a common wear item on turbocharged direct-injection engines. Estimated repair cost: $300 - $600.

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2021 Audi TTS Maintenance guide

Name: Maintenance dataset for 2021 Audi TTS
Creator: Carfocal

v1.0Updated Jun 2, 2026Ethan Miller4 Sources Analyzed

MAINTENANCE SUMMARY

The 2021 Audi TTS, with a 'Good' reliability verdict, presents a manageable maintenance profile. Owners should prioritize awareness of its 134 Technical Service Bulletins (TSBs), which suggest potential minor issues requiring attention.

View Critical Issue: DSG/S-Tronic Transmission Issues

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Reliability Score

Est. Annual Maintenance Cost

$700 - $1,100

TSBs & Recalls

134 TSBs | 0 Recalls

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Key Takeaways

The 2021 Audi TTS has a 'Good' reliability verdict with no recalls or complaints logged.
A high TSB count (134) suggests potential for minor issues requiring owner diligence.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance