Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Section 52 (4.2L V8 5V Fuel Injection And Ignition, Engine Code(S): Bat, BNK)
2009 Audi A6 BaseSECTION Section 52 (4.2L V8 5V Fuel Injection And Ignition, Engine Code(S): Bat, BNK)
WARNING: This page is about a different car, the 2006 Audi A6 and 2005 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
- 24 - Multiport Fuel Injection (MFI)
- Motronic fuel injection system, servicing
- Safety precautions
- When working on the fuel supply/injection system, pay careful attention to the following "6 rules" of cleanliness:
- Notes
- Component locations, overview
- Notes
- Component located on 3-socket relay carrier in left plenum chamber
- Component located on 4-socket relay carrier in E-box of right plenum chamber
- Connector strip on right side of bulkhead
- Connector strip beneath coolant reservoir
- Engine viewed from front
- Engine viewed from rear
- Secondary Air Injection (AIR) Pump Motor V101
- Air filter, overview
- Air filter, removing and installing
- Intake manifold, overview
- Intake manifold, removing and installing
- Fuel system, bleeding
- Fuel pressure regulator and residual pressure, checking
- Checking for leaks, injection quantity and spray pattern of fuel injectors
- Wiring and components, checking with adapter cable (121-pin) V.A.G 1598/31 test box
- Engine Control Module (ECM) J623, replacing
- Mass air flow (MAF) sensor, removing and installing
- Oxygen sensors, removing and installing
- Motronic fuel injection system, servicing
- 28 - Ignition/Glow plug System
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.