AUDI BHF — 4.2L Engine
4.2L · 344 hp
Engine overview
Manufacturer
AUDI
Displacement
4.2 L
Power
344 hp
Production years
2006-2009
Fuel type
Petrol
Vehicles with this engine
8E
8H
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | BHF |
| Capacity | 4163 cc |
| Idle speed | 640 - 720 rpm |
| Normal | 10.0 - 14.0 bar |
| Minimum | 9.0 bar |
| Differential limit between cylinders | 3.0 bar |
| Oil pressure | 2.0 > / 2000 3.5 > / 3500 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.1.1 |
| Number of cylinders | 8 |
| Firing order | 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2 |
| Injector resistance | 13 - 16 ohms |
| Injection pressure/system pressure | 3.5 4.0 bar |
| Lambda | 0.97 – 1.03 |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 1.4 - 1.6 bar |
| Thermostat opens at | 87 °C |
| Thermostat fully open at | 102 °C |
Brakes
| Disc thickness, front | 22.0 (1LZ) 25.0 (1LB, 1LE, 1LT, 1LF) 30.0 (1LA, 1LD, 1LJ) 34.0 (1LP) 36.0 (1LW) mm |
| Disc thickness, front, min. | 20.0 (1LZ) 23.0 (1LB, 1LE, 1LT, 1LF) 28.0 (1LA, 1LD, 1LJ) 32.0 (1LP) mm |
| Brake pad thickness, front | 19.3 (1LZ) 20.3 (1LB, 1LE, 1LT, 1LF,1LA, 1LD, 1LJ, 1LP) 20.4 (1LW) mm |
| Brake pad thickness, front, min. | 7.0 9.5 (1LW) mm |
| Disc thickness, rear | 10.0 (1KD) 12.0 (1KP, 1KW) 22.0 (1KE/1KY) mm |
| Disc thickness, rear, min. | 8.0 (1KD) 10.0 (1KP, 1KW) 20.0 (1KE/1KY) mm |
| Brake pad thickness, rear | 16.0 (1KD, 1KP, 1KW) 17.5 (1KE) mm |
| Brake pad thickness, rear, min. | 7.0 (1KD, 1KP, 1KW) 8.0 (1KE) mm |
Steering and wheel alignment
| Standard suspension | 1BA = A |
| Sport suspension | 1BE/1BV = B |
| Standard suspension | 2MC = C |
| Sport suspension | 1BD = C |
| Sport suspension | 2ME = D |
| Heavy-duty suspension | 1BR = E |
| Toe-in, front | 0° 10' ± 0° 02' ° |
| Camber, front | [НЕ е една стойност — зависи от изпълнението] A = -0° 30' ± 0° 25' B = -0° 47' ± 0° 25' C = -0° 50' ± 0° 25' D = -1° 16' ± 0° 25' E = -0° 21' ± 0° 25' ° |
| Max. difference left side - right side | 0° 30' ° |
| Bump steer, front | 0° 09' ± 0° 07' ( >8E_2_025687) 0° 14' ± 0° 07' ( 8E_2_025688>) ° |
| Max. difference left side - right side | 0° 10' ° |
| Toe-in, rear | 0° 20' + 0° 10' / 0° 05' ° |
| Camber, rear | -1° 20' ± 0° 30' ° |
| Camber, front | -0° 47' ± 0° 25' ° |
| Toe-in, front | 0° 10' ± 0° 05' ° |
| Bump steer, front | 0° 14' ± 0° 07' ° |
| Toe-in, rear | 0° 20 ' +0° 10 / -0° 05' ° |
Capacities
| Engine sump, incl. filter | 8.5 l |
| Automatic transmission | 09L |
| Initial filling | 9.8 l |
| Gearbox refill after overhaul | 8.0 l |
| Differential, 4WD front | 1.1 l |
| Transfer box | 0.55 l |
| Differential, 4WD rear | 0AR: 0.9 l |
| Manual transmission | 0A3 |
| Gearbox refill | 3.2 l |
| Cooling system | 12.0 l |
| Air-conditioner refrigerant | 500 ± 20 g |
| Air-conditioner compressor oil | 130 ± 10 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 30 Nm |
| Cylinder head bolts — Stage 2 | 60 Nm |
| Cylinder head bolts — Stage 3 | 90 ° |
| Cylinder head bolts — Stage 4 | 90 ° |
| Manual transmission filler plug | 40 Nm |
| Differential filler plug | 45 Nm |
| Spark plugs | 30 Nm |
| Oxygen sensor | 55 Nm |
| Wheel bolts | 120 Nm |
Emissions
| Emission code | 70/220*2003/76B |
| Emission standard | Euro 4 |
| CO2 average | 322 g/km |
| CO | 0.430 g/km |
| HC | 0.046 g/km |
| NOx | 0.040 g/km |
| CO2 average | 295 - 298 g/km |
| CO | 0.269 g/km |
| HC | 0.031 g/km |
| NOx | 0.018 g/km |
Engine codes in the same family
The same code prefix usually means the same block with a different output, fuel or model year. Procedures are often shared — check the code on the engine plate.
Workshop procedures for this engine
Step-by-step procedures from the workshop database, carrying 90 torque figures.
- Removing and installing camshaft timing chains · 24 torque figures
- Removing and installing camshafts · 18 torque figures
- Detaching camshaft timing chains from camshafts · 18 torque figures
- Removing and installing all timing chain covers · 7 torque figures
- Removing and installing exhaust manifold (right-side) · 6 torque figures
- Crankshaft - exploded view of components · 8 torque figures
- Removing and installing exhaust manifold (left-side) · 4 torque figures
- Removing and installing drive chain for valve gear · 1 torque figures
- Removing engine - vehicles with automatic gearbox · 1 torque figures
- Removing and installing oil filter housing
- Removing and installing coolant pipe (right-side) · 1 torque figures
- Removing and installing coolant pipe (left-side)
- Removing and installing suction-jet pump in left fuel tank chamber
- Removing and installing spur gear drive
- Removing and installing auxiliary radiator (right-side) · 1 torque figures
- Removing and installing fuel pump control unit J538
- Removing and installing front exhaust pipe (left-side) with starter catalytic converter and main catalytic converter (vehicles with automatic gearbox)
- Checking fuel pump delivery rate - vehicles with 4-cylinder TFSI engine
- Removing and installing chain for auxiliary drives · 1 torque figures
- Removing and installing front exhaust pipe (left-side) with starter catalytic converter and main catalytic converter (vehicles with manual gearbox)
- Removing and installing front exhaust pipe (right-side) with starter catalytic converter and main catalytic converter (vehicles with automatic gearbox)
- Removing and installing front exhaust pipe (right-side) with starter catalytic converter and main catalytic converter (vehicles with manual gearbox)
- Checking fuel pump delivery rate - vehicles with 8-cylinder FSI engine
- Checking fuel pump control unit J538 - vehicles with 4-cylinder TFSI engine
- Checking fuel gauge sender 2G169
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.