APZ engine — Audi 2.4 (2.4L)
2.4L · 165 hp
Engine overview
Manufacturer
AUDI
Displacement
2.4 L
Power
165 hp
Production years
1998-2002
Fuel type
Petrol
Vehicles with this engine
4B
Torque figures by job
From the step-by-step procedures for this engine — each figure sits in the step that uses it.
Removing and installing sump (top section)
- 5 Nm (3.7 lb-ft) — Fit top section of sump in position (2nd mechanic required) and pre-tighten bolts (1) and…
Draining and filling cooling system
- 20 Nm (15 lb-ft) — Renew O-ring and tighten drain plug (arrow) to
- 15 Nm (11 lb-ft) — Renew seal and tighten bleed screw (arrow) to
Draining and filling cooling system
- 20 Nm (15 lb-ft) — Renew O-ring and tighten drain plug (arrow) to
- 15 Nm (11 lb-ft) — Renew seal and tighten bleed screw (arrow) to
Removing and installing toothed belt
- 15 Nm (11 lb-ft) — Apply torque wrench at hexagon socket of tensioning roller and tension belt with a torque…
- 30 Nm (22 lb-ft) — Tighten camshaft sprockets to
Removing and installing toothed belt
- 15 Nm (11 lb-ft) — Tension belt by applying a torque of
- 30 Nm (22 lb-ft) — Tighten camshaft sprockets to
- 10 Nm (7.4 lb-ft) — Tighten bolts (1) to
Removing and installing sealing flange (front)
- 10 Nm (7.4 lb-ft) — Tighten bolts (1) to
Removing, installing and checking thermostat
- 15 Nm (11 lb-ft) — Pre-tension tensioning roller by applying a torque of
Removing, installing and checking thermostat
- 15 Nm (11 lb-ft) — Pre-tension tensioning roller by applying a torque of
Stress-free alignment of exhaust system
- 40 Nm (30 lb-ft) — Tighten bolt connections of clamps evenly to
- 40 Nm (30 lb-ft) — Tighten bolts on front clamps and evenly to
- 40 Nm (30 lb-ft) — Tighten bolt connections for clamps (rear) evenly to
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | APZ |
| Capacity | 2393 cc |
| Idle speed | 670 - 770 rpm |
| Normal | 9.0 - 14.0 bar |
| Minimum | 7.5 bar |
| Differential limit between cylinders | 3.0 bar |
| Oil pressure | 2.0 / 2000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.1 |
| Number of cylinders | 6 |
| Firing order | 1 - 4 - 3 - 6 - 2 - 5 |
| Ignition coil resistance, secondary | 8000 - 14000 ohms |
| Spark plugs (make and type) | NGK BKR6EKUB Bosch F7 LTCR |
| Spark plug gap | 0.7 - 0.9 mm |
| Injection pressure/system pressure | 3.5 4.0 bar |
| CO exhaust gas | < 0.5 % |
| CO2 | > 13.0 % |
| HC | < 100 ppm |
| O2 | 0.1 - 0.5 % |
| Lambda | 0.97 - 1.03 |
| Lambda change (Delta Lambda) | 0.03 |
| Oil temperature during test | 80 °C |
| Injector resistance | 13.5 - 15.5 ohms |
| Spark plug cable resistances | 16 - 27 kohms |
| Injection pressure/system pressure | 3.2 - 3.8 3.8 - 4.2 bar |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 1.4 - 1.6 bar |
| Thermostat opens at | 87 - 102 °C |
| Stage 1/Fan 1 | 92 - 97 °C |
| Stage 2/Fan 2 | 99 - 105 °C |
| Thermostat opens at | 86 °C |
| Stage 1/Fan 1 | 92 -97 °C |
Electrical
| Battery | 70 Ah |
| Alternator | 90 A |
| Battery | 66 / 74 Ah |
| Alternator | 90 / 120 A |
Capacities
| Engine sump, incl. filter | 6.0 l |
| Manual transmission | 01A |
| Gearbox refill | 2.75 l |
| Differential | 1.9 l |
| Cooling system | 8.5 l |
| Air-conditioner refrigerant | 650 - 700 (-> 11/1997) g |
| Air-conditioner refrigerant | 700 - 750 (11/1997 ->) g |
| Air-conditioner refrigerant | 550 - 600 (11/1998 ->) g |
| Air-conditioner compressor oil | 250 - 300 ml |
| Manual transmission | 012 / 01W |
| Gearbox refill | 2.25 l |
| Gearbox refill | 2.7 l |
| Automatic transmission | 01V |
| Gearbox refill | 2.6 - 3.0 l |
Torque settings
| Cylinder head bolts — Stage 1 | 60 Nm |
| Cylinder head bolts — Stage 2 | 180 ° |
| Front hub | M14: 115 Nm + 180° M16: 190 Nm + 180° |
| Rear hub | 115 Nm + 180° |
| Spark plugs | 30 Nm |
| Oxygen sensor | 50 Nm |
| Knock sensor | 20 Nm |
| Big-end bearing cap | 30 Nm + 90° Nm |
| Flywheel | 60 Nm + 90° Nm |
| Oil plug | 30 Nm |
| Wheel bolts | 120 Nm |
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 292 torque figures.
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing sump (top section) – Audi A6 C5 · 25 torque figures
- Cylinder head - exploded view · 21 torque figures
- Crankshaft - exploded view · 19 torque figures
- Installing cylinder head – Audi A3 · 14 torque figures
- Removing and installing drive plate – Audi A4 B5 · 17 torque figures
- Renewing sealing flange (gearbox end) – Audi A3 · 9 torque figures
- Measuring radial clearance of crankshaft – Audi A3 · 11 torque figures
- Crankshaft - exploded view of components · 8 torque figures
- Removing, installing and checking thermostat – Audi · 4 torque figures
- Removing and installing camshafts and camshaft adjuster – Audi · 4 torque figures
- Removing sump (top section) – Audi A4 B5 · 2 torque figures
- Removing and installing sealing flange (front) – Audi A6 C5 · 1 torque figures
- Checking radial clearance of conrod bearings – Audi A4 B5 · 6 torque figures
- Removing and installing cylinder head cover (right-side) · 2 torque figures
- Removing and installing drive plate - vehicles with automatic gearbox 01V · 5 torque figures
- Renewing camshaft oil seals – Audi A6 C6 · 2 torque figures
- Removing and installing intake manifold – Audi TT Mk1
- Separating centre and rear silencers · 5 torque figures
- Removing cylinder head (left-side)
- Renewing valve stem oil seals – Audi A3
- Checking radial clearance of conrods · 4 torque figures
- Removing and installing continued coolant circulation pump V51
Got a APZ problem? Ask for free.
Describe the symptoms — TorqFix replies with a diagnosis cited from verified workshop data.
Get free diagnosis →Who makes these pages, and how
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.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.