Audi S4 B8 B9 3.0 TFSI Supercharger Belt Failure
Audi
A4
2009
3.0 TFSI CGWB/CWGD
⚡ Quick Summary
Severity Level
High
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟠 Fix Soon
The supercharger belt on B8/B9 S4 3.0 TFSI wears and can snap, causing the supercharger to stop boosting. Power loss is immediate. Supercharger belt and tensioner replacement costs £400-700 and should be done every 60,000 miles.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Audi A4 2009 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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