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 6 (4.2L - ENGINE MECHANICAL, ENGINE CODE(S): BHF)
2009 Audi A6 Base
Section 6 (4.2L - Engine Mechanical, Engine Code(S): BHF)
2009 Audi A6 BaseSECTION Section 6 (4.2L - Engine Mechanical, 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.
- 00 - General, Technical Data
- 10 - Engine - Assembly
- 13 - Engine - Crankshaft, Cylinder Block
- Engine, disassembling and assembling
- Belt pulley side, servicing
- Timing chain side, servicing
- Dual-mass flywheel, component overview
- Dual-mass flywheel, removing and installing
- Dual-mass flywheel needle bearings, pulling out and driving in
- Drive plate, component overview
- Drive plate, removing and installing
- Crankshaft seal (timing chain side), replacing
- Timing chains covers, component overview
- Timing chain covers (All), removing and installing
- Camshaft timing chain, component overview
- Camshaft timing chain, removing and installing
- Camshaft timing chains, removing from camshafts
- Drive chain for timing mechanism - component overview
- Drive chain for timing mechanism, removing and installing
- Chain for power take-off, component overview
- Chain for power take-off, removing and installing
- Power take-off, component overview
- Power take-off seals, replacing
- Spur gear unit, removing and installing
- Crankshaft, removing and installing
- Piston and connecting rod, disassembling and assembling
- 15 - Engine - Cylinder head, Valvetrain
- Cylinder head, removing and installing
- Intake manifold, removing and installing
- Valvetrain, servicing
- 17 - Engine - Lubrication
- Lubrication system components, removing and installing
- Lubrication system components, removing and installing
- Oil pump, lower section of oil pan, component overview
- Oil pan (lower part), removing and installing
- Oil pump, removing and installing
- Upper section of oil pan, component overview
- Oil pan (upper part), removing and installing
- Oil check valves and spray nozzle valve - component overview
- Oil check valves and spray nozzle valve, removing and installing
- Oil filter housing, component overview
- Oil filter housing, removing and installing
- Oil cooler, removing and installing
- Oil Pressure Switch F1 , removing and installing
- Oil pressure and oil pressure switch, checking
- Engine oil
- Oil level, checking
- Lubrication system components, removing and installing
- 19 - Engine - Cooling system
- Cooling system components, removing and installing
- Cooling system components, removing and installing
- Coolant hose connection diagram
- Cooling system, draining and filling
- Coolant pump and coolant thermostat, component overview
- Coolant pump, removing and installing
- After-Run Coolant Pump V51 , removing and installing
- Coolant thermostat, removing and installing
- Thermostat, checking
- Coolant pipes/hoses, component overview
- Front coolant pipe, removing and installing
- Rear coolant pipe, removing and installing
- Left coolant pipe, removing and installing
- Right coolant pipe, removing and installing
- Radiator, removing and installing
- Left auxiliary cooler, removing and installing
- Right auxiliary cooler, removing and installing
- Cooling system, checking for leaks
- Electric coolant fan, function
- Electric coolant fan, checking
- Coolant Fan V7 (left), removing and installing
- Coolant Fan 2 V177 (right), removing and installing
- Cooling system components, removing and installing
- 26 - Exhaust system, Emission controls
- Exhaust system components, removing and installing
- Exhaust system components, removing and installing
- Exhaust system, component overview
- Center muffler and rear muffler, separating
- Left front exhaust pipe with primary and main catalytic converter (vehicles with manual transmission), removing and installing
- Right front exhaust pipe with primary and main catalytic converter (vehicles with manual transmission), removing and installing
- Left front exhaust pipe with primary and main catalytic converter (vehicles with automatic transmission), removing and installing
- Right front exhaust pipe with primary and main catalytic converter (vehicles with automatic transmission), removing and installing
- Left exhaust manifold, removing and installing
- Right exhaust manifold, removing and installing
- Exhaust system, installing free of tension
- Exhaust system, checking for leaks
- Secondary Air Injection (AIR), servicing
- Secondary Air Injection (AIR), servicing
- Principle and function
- Secondary Air Injection (AIR), component overview
- Secondary Air Injection (AIR) pump, removing and installing
- Combination valve for Secondary Air Injection (AIR), checking function and for proper seal
- Left combination valve for Secondary Air Injection, removing and installing
- Right combination valve for Secondary Air Injection, removing and installing
- Exhaust flap
- Exhaust system components, removing and installing
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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.