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 7 (4.2L - ENGINE MECHANICAL, ENGINE CODE(S): BNS)
2009 Audi A6 Base
Section 7 (4.2L - Engine Mechanical, Engine Code(S): BNS)
2009 Audi A6 BaseSECTION Section 7 (4.2L - Engine Mechanical, 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.
- 00 - General, Technical Data
- 10 - Engine - Assembly
- 13 - Engine - Crankshaft, Cylinder Block
- Belt pulley side, servicing operations
- Timing chain side, servicing operations
- Dual-mass flywheel, component overview
- Dual-mass flywheel, removing and installing
- Needle bearing on dual mass flywheel, pulling out and driving in
- Crankshaft seal (timing chain side), replacing
- Timing chain covers, component overview
- Left and right timing chain covers, removing and installing
- Lower timing chain cover, removing and installing
- Camshaft timing chain, component overview
- Camshaft timing chains, removing from camshafts
- Camshaft timing chain, removing and installing
- Drive chain for timing mechanism, component overview
- Drive chain for timing mechanism, removing and installing
- Power take-off drive chain, component overview
- Power take-off drive chain, removing and installing
- Power take-off, assembly overview
- Seals for power take-off, replacing
- Spur gear unit, removing and installing
- Crankshaft, removing and installing
- Piston and connecting rod, disassembling and assembling
- 15 - Engine - Cylinder head, Valvetrain
- 17 - Engine - Lubrication
- Lubrication system components, removing and installing
- Lubrication system components, removing and installing
- Oil pump, lower section of oil pan, component overview
- Lower part of oil pan, removing and installing
- Oil pump, removing and installing
- Upper section of oil pan, component overview
- Upper part of oil pan, removing and installing
- Oil check valve and spray nozzle valve, component overview
- Oil check valve and spray nozzle valve, removing and installing
- Crankcase ventilation hose, removing and installing
- Oil filter housing, component overview
- Oil filter housing, removing and installing
- Oil cooler at engine, removing and installing
- Oil cooler at lock carrier, 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 regulator, component overview
- Coolant pump, removing and installing
- Coolant thermostat, removing and installing
- Thermostat, checking
- After-Run Coolant Pump V51 , removing and installing
- Coolant pipes, component overview
- Front coolant line, removing and installing
- Rear coolant line, 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
- Coolant Fan Control (FC) Control Module J293 , removing and installing
- 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, removing and installing
- Right front exhaust pipe with primary and main catalytic converter, removing and installing
- Exhaust manifold, component overview
- 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 leaks
- Left combination valve for secondary air injection (AIR), removing and installing
- Right combination valve for secondary air injection, removing and installing
- Exhaust flap, servicing
- 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.