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 MANUALSAUDI2004A8REPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEM4.2L - ENGINE MECHANICAL, ENGINE CODE(S): BFM
2004 Audi A8
4.2L - Engine Mechanical, Engine Code(S): BFM
2004 Audi A8SECTION 4.2L - Engine Mechanical, Engine Code(S): BFM
- 00 - General, Technical Data
- 10 - Engine - Assembly
- 13 - Engine - Crankshaft, Cylinder Block
- Engine, disassembling and assembling
- Sealing flange and drive plate, assembly overview
- Crankshaft, assembly overview
- Pistons and connecting rods, assembly overview
- 15 - Engine - Cylinder head, Valvetrain
- Cylinder head, assembly overview
- Compression pressures, checking
- Valvetrain, assembly overview
- Valvetrain, assembly overview
- Camshafts, checking axial clearance
- Camshaft seals, replacing
- Camshaft Position (CMP) Sensor seals, replacing
- Camshafts and camshaft adjusters (left cylinder head), removing and installing
- Camshafts and camshaft adjusters (right cylinder head), removing and installing
- Roller rocker lever, removing and installing
- Valve stem seals, replacing
- Valve guides, checking
- Valves, checking
- Valve seats, reworking
- Camshaft adjustment, checking
- 17 - Engine - Lubrication
- Lubrication system components, removing and installing
- Lubrication system components, removing and installing
- Oil pump, lower section of oil pan, assembly overview
- Oil Level Thermal Sensor G266 , removing and installing
- Lower part of oil pan, removing and installing
- Chain drive for oil pump, removing and installing
- Oil pump, removing and installing
- Oil pan (upper part), assembly overview
- Oil pan (upper part), removing and installing
- Oil check valves, assembly overview
- Oil check valves, replacing
- Oil pressure and oil pressure switch F1 , checking
- Engine oil
- Oil level, checking
- Oil filter housing, assembly overview
- Oil filter housing, removing and installing
- Lubrication system components, removing and installing
- 19 - Engine - Cooling system
- Cooling system components, removing and installing
- Cooling system components, removing and installing
- Connection diagram for coolant hoses (without auxiliary heater)
- Connection diagram for coolant hoses (with auxiliary heater)
- Cooling system, draining and filling
- Cooling system, checking for leaks
- Coolant pump and coolant thermostat, assembly overview
- Coolant pump, removing and installing
- Coolant thermostat, removing and installing, checking
- Coolant pipe to oil filter housing, removing and installing
- Oil cooler, assembly overview
- Oil cooler, removing and installing
- Thermostat, checking
- Radiator and coolant fan, assembly overview
- Radiator, removing and installing
- Converting to radiator with bypass
- Fan shroud, removing and installing
- Coolant Fan V7 and Coolant Fan 2 V177 , 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, assembly overview
- Front exhaust system
- Exhaust system, rear
- Individual suspension components, left side
- Individual components of suspension, right side
- Components of center bracket
- Installation position of front double clamp
- Installation position of rear double clamp
- End pipe, replacing
- A separating point has been provided in the connecting pipe for individual replacement of center or rear muffler
- Left exhaust manifold, removing and installing
- Right exhaust manifold, removing and installing
- Catalytic converter with left front muffler, removing and installing
- Catalytic converter with right front muffler, removing and installing
- Left front muffler, removing and installing
- Right front muffler, removing and installing
- Exhaust system, installing free of tension
- Exhaust system, checking for leaks
- Secondary air injection (AIR) system
- Secondary air injection (AIR) system
- Secondary Air Injection (AIR) Pump Motor V101 , removing and installing
- Combination valve for Secondary Air Injection (AIR), checking for function and leaks
- Secondary Air Injection (AIR) (left combination valve), removing and installing
- Secondary Air Injection (AIR) (right combination valve), removing and installing
- 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.