Audi A4 Engine Knocking — 2.0 TFSI HPFP Cam Follower
Audi
A4
2005
2.0 TFSI BWE/BGB
⚡ Quick Summary
Severity Level
High
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Can become a safety issue if left unresolved
Urgency Level
🟠 Fix Soon
A tapping noise from the top of Audi A4 2.0 TFSI engine indicates worn HPFP cam follower. The follower collapses causing the pump to run on bare metal. Follower inspection and replacement costs £80-200. If left, the pump and cam lobe are damaged adding £800-1,500 to the repair.
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 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🚗 More About This Vehicle
Explore more Audi models
📖 Related Repair Guides
Help other owners by sharing your experience.
Your real-world fix helps thousands of drivers worldwide. Takes 2 minutes.