Checking injectors for leaks: Audi A6 C6 (BAT, BHT, BNK, BSB, …)
Step-by-step checking injectors for leaks for the Audi A6 C6: 10 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 A6 C6 (4F, 2004–2011)
- Special tools named: V.A.G 1598/31
- Renewed: faulty injector
Don't miss
- Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
📐 1 workshop diagram for BAT
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Remove engine cover.
- Unplug electrical connectors from injectors.
- Remove resonance chamber (1).
- Unbolt fuel rail from intake manifold (arrows) and lift it off intake manifold together with injectors.
- Place the injector which is to be tested into measuring glass of injection rate testerV.A.G 1602.
- Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
- Bridge contacts 1 and 65 on the test box using test leads from auxiliary measuring setV.A.G 1594 C. (This creates an earth connection to one side of the fuel pump relay coil.)
- Switch on ignition. [Note: Once the ignition has been switched on the fuel pump runs continuously, even if the engine is not running. This is because the fuel pump relay receives a positive voltage supply via the central electrics when the ignition is switched on. The earth connection for the fuel pump relay is set up via the test lead bridge connection in the test box.]
- Visually check the fuel injectors for leaks. When the fuel pump is running, no more than 1 to 2 drops a minute should escape from any one of the injectors.
- If the fuel loss is greater, switch off the fuel pump (turn off ignition) and renew the faulty injector.
Ask TorqFix about your Audi BAT — 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 BAT — 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.