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.
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HOMESERVICE MANUALSAUDI2009A6 BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (4.2L - FUEL INJECTION AND IGNITION, ENGINE CODE(S): BNS)
2009 Audi A6 Base
Section 18 (4.2L - Fuel Injection And Ignition, Engine Code(S): BNS)
2009 Audi A6 BaseSECTION Section 18 (4.2L - Fuel Injection And Ignition, Engine Code(S): BNS)
WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. 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
- Rules of cleanliness for performing work on fuel injection system
- Procedure that must be performed before opening the high-pressure fuel injection system - Pay close attention!
- Technical data
- Component location, overview
- Notes
- Location Engine Control Module (ECM) J623
- Locations in 4-pin relay carrier
- Location Engine Control Module (ECM) 2 J624
- Location Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185
- Installed location Brake light switch F/Brake pedal switch F47 , Clutch pedal switch F36
- Clutch Pedal Starter Interlock Switch F194
- Bracket for connectors on transmission
- Oxygen sensors location, cylinder bank 1 (right)
- Oxygen sensors location, cylinder bank 2 (left)
- Location After-Run Coolant Pump V51
- Location Engine Speed (RPM) Sensor G28
- Component location of Engine Coolant Temperature (ECT) Sensor G62
- Location Throttle Valve Control Module J338
- Locations outside on right cylinder head
- Locations outside on left cylinder head
- Locations inside on left cylinder head
- Locations inside on right cylinder head
- Locations engine compartment
- Installation location of Secondary Air Injection (AIR) Solenoid Valve N112
- Air filter, component overview
- Air filter housing, removing and installing
- Air filter element, removing and installing
- Mass Air Flow (MAF) Sensor G70 , removing and installing
- Intake manifold, component overview
- Intake manifold, removing and installing
- Fuel injections and fuel rail, component overview
- Fuel injectors, removing and installing
- Fuel pressure and residual pressure before high pressure pump, checking
- High pressure pump, component overview
- High pressure pump, removing and installing
- Wiring and components, checking with Test box V.A.G 1598/42
- Engine Control Module (ECM) J623 , removing and installing
- Engine Control Module (ECM) 2 J624 , removing and installing
- Oxygen sensors, removing and installing
- Motronic fuel injection system, servicing
- 28 - Ignition/Glow plug System
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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.