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.
2004 Audi A8FACTORY OEM SERVICE PROCEDURE
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
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.