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 17 (4.2L - FUEL INJECTION AND IGNITION, ENGINE CODE(S): BHF)
2009 Audi A6 Base
Section 17 (4.2L - Fuel Injection And Ignition, Engine Code(S): BHF)
2009 Audi A6 BaseSECTION Section 17 (4.2L - Fuel Injection And Ignition, Engine Code(S): BHF)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Audi S4, 2008 Audi S4, 2007 Audi S4, 2006 Audi S4, and 2005 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
- 24 Multiport Fuel Injection (MFI)
- Motronic injection system, servicing
- Safety precautions
- Rules for cleanliness
- Technical data
- Component locations overview
- Notes
- MIL exhaust emissions warning lamp
- Exhaust emissions warning lamp (CHECK)
- EPC warning lamp
- Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-
- Installation location of Throttle Position (TP) sensor -G79- Sender -2- for accelerator pedal position -G185-
- Installation location of Brake light switch -F-, Brake Pedal Switch (cruise control/Diesel Direct Fuel Injection) -F47- and Clutch Vacuum Vent Valve Switch -F36-
- Installation location of Fuel Pump (FP) Relay -J17-
- Installation locations in plenum chamber electronics box
- Installation location of engine control module in plenum chamber electronics box
- Assignment of holder for connectors (right side)
- Connector console beneath coolant expansion tank
- Rear view
- Front view
- Secondary Air Injection (AIR) Pump Motor -V101-
- Leak detection pump (LDP) -V144-
- Fuel pressure regulator and holding pressure, checking
- Injection quantity, leakage, and spray pattern of injectors, checking
- Wiring and component check using test box V.A.G 1598/31
- Motronic Engine Control Module (ECM) -J220-, replacing
- Intake manifold, assembly overview
- Intake manifold, removing and installing
- Lock carrier in service position, overview
- Heated Oxygen sensor (HO2S) before catalytic converter, bank 1 (right), removing and installing
- Heated Oxygen sensor (HO2S) before catalytic converter, bank 1 (right), removing and installing
- Heated Oxygen Sensor before catalytic converter, bank 2 (left), removing and installing
- Heated Oxygen Sensor (HO2S) after catalytic converter, bank 1 (right), removing and installing
- Heated Oxygen Sensor (HO2S) after catalytic converter, bank 2 (left), removing and installing
- Motronic 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.