Checking fuel pressure (low pressure) system: Audi A3 2.0 TDI (CAGA, CAGB, CAGC, CAHA, …)
Step-by-step checking fuel pressure (low pressure) system for the Audi A3 2.0 TDI: 11 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A3 (8P, 2003–2012)
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- In this way the K-Jetronic pressure testerV.A.G 1318 is connected into the fuel supply line.
- Check fuel system for leaks.
📐 38 workshop diagrams for CAGA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Remove engine cover panel .
- ⚠ Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Disconnect fuel supply line (arrow) at high-pressure pump.
- Connect K-Jetronic pressure testerV.A.G 1318 to fuel supply line (1) with suitable adapter (2). Connect the other adapter (3) from K-Jetronic pressure testerV.A.G 1318 to open connection at high-pressure pump. [Note: In this way the K-Jetronic pressure testerV.A.G 1318 is connected into the fuel supply line.]
- Connect a .
- Switch on ignition.
- Select "“Engine electronics”" in vehicle self-diagnosis.
- Then select "“Basic setting”".
- Select "“Display group 35”".
- Press "“activate”" button.
- The fuel pumps start running.
- Let fuel pumps run until maximum fuel pressure has built up. [Note: Check fuel system for leaks.]
Ask TorqFix about your Audi CAGA — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your Audi CAGA — free → or sign up free to see the drawingsOther AUDI procedures
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.