AUDI APX — 1.8L Engine
1.8L · 224 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | APX |
| Capacity | 1781 cc |
| Idle speed | 800 - 920 rpm |
| Normal | 10.0 - 13.0 bar |
| Minimum | 7.0 bar |
| Differential limit between cylinders | < 3.0 bar |
| Oil pressure | > 1.3 bar/rpm |
| Oil pressure | 3.5-4.5 / 3500 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.5 |
| Number of cylinders | 4 |
| Firing order | 1-4-3-2 |
| Ignition coil resistance, primary | 0.4 - 0.6 ohms |
| Ignition coil resistance, secondary | 8000 - 14000 ohms |
| Injector resistance | 12 - 13 ohms |
| Spark plugs (make and type) | VW/Audi 101 000 51 AA Bosch F7LTCR |
| Spark plugs (make and type) | VW/Audi 101 000 63 AA NGK PFR6Q |
| Spark plug gap | 0.8 mm |
| Injection pressure/system pressure | 2.5 3.0 bar |
| CO exhaust gas | < 0.5 % |
| CO2 | 13 % |
| HC | 70 ppm |
| O2 | 0.1 - 0.5 % |
| Lambda | 0.97 - 1.03 |
| Lambda change (Delta Lambda) | 0.03 |
| Oil temperature during test | 80 °C |
| Fast-idle speed | 2500 - 2800 rpm |
| CO at fast-idle speed | < 0.3 % |
| Closed-loop test at: | 700 - 1020 rpm |
| Conditioning catalytic converter | 2 / 2500 min/rpm |
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 |
Electrical
| Battery | 62 Ah |
| Alternator | 90 / 120 A |
Brakes
| Disc thickness, front | 25.0 mm |
| Disc thickness, front, min. | 23.0 mm |
| Disc thickness, rear | 22.0 mm |
| Disc thickness, rear, min. | 20.0 mm |
| Brake pad thickness, front | 14.0 mm |
| Brake pad thickness, front, min. | 2.0 mm |
| Brake pad thickness, rear | 12.0 mm |
| Brake pad thickness, rear, min. | 2.0 mm |
Steering and wheel alignment
| Toe-in, front | 0° 08' ± 0° 07' ° |
| Camber, front | 0° 45' ± 0° 30' ° |
| Camber, front | 0° 58' ± 0° 30' ° |
| Castor, front | 7° 58' ° |
| Castor, front | 8° 15' ° |
| Max. difference left side - right side | 0° 30' ° |
| Toe-in, rear | 0° 28' ± 0° 10' ° |
| Toe-in, rear | 0° 39' ± 0° 10' ° |
| Max. difference left side - right side | 0° 15' ° |
| Camber, rear | -2° 00' ± 0° 20' ° |
| Toe-in, rear | 0° 15' +0° 15' / -0° 10' ° |
| Max. difference left side - right side | 0° 20' ° |
Wheels and tyres
| Tyre size | 205 / 55 R16 |
| Front tyre pressure | 2.3 bar |
| Rear tyre pressure | 2.8 bar |
Capacities
| Engine sump, incl. filter | 4.5 l |
| Manual transmission | 02J 02M |
| Gearbox refill | 02J: 2.0 02M: 2.6 l |
| Differential, 4WD rear | 1.0 l |
| Haldex coupling | 0.25 l |
| Cooling system | 5.0 l |
| Air-conditioner refrigerant | 775 ± 25 g |
| Air-conditioner compressor oil | 135 ± 15 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 40 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Spark plugs | 30 Nm |
| Main bearing cap | 65 Nm + 90° Nm |
| Big-end bearing cap | 30 Nm + 90° Nm |
| Wheel bolts | 120 Nm |
| Front hub | 265 Nm |
| Front hub | 190 Nm + 90° |
| Front hub | 240 Nm + 90° |
| Rear hub | 220 Nm |
Emissions
| Emission code | 70/220*1996/69 |
| Emission standard | Euro 2 (12/1998 ->) |
| CO2 average | 226 - 228 g/km |
| CO | 0.628 g/km |
| HC NOx | 0.144 g/km |
| Emission code | 70/220*1999/102A |
| Emission standard | Euro 3 (07/2000 ->) |
| CO | 1.331 g/km |
| HC | 0.115 g/km |
| NOx | 0.076 g/km |
| CO2 average | 221 - 223 g/km |
| CO2 average | 226 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 296 torque figures.
- Removing and installing toothed belt · 56 torque figures
- Removing engine · 41 torque figures
- Installing engine · 36 torque figures
- Removing and installing cylinder head · 24 torque figures
- Stress-free alignment of exhaust system · 54 torque figures
- Removing and installing turbocharger · 10 torque figures
- Removing and installing sump · 10 torque figures
- Removing and installing poly V-belt · 11 torque figures
- Draining and filling cooling system · 6 torque figures
- Separating engine and gearbox · 7 torque figures
- Removing and installing coolant pump · 6 torque figures
- Measuring radial clearance of conrods · 8 torque figures
- Checking compression · 5 torque figures
- Removing and installing oil pump · 5 torque figures
- Adjusting assembly mountings · 4 torque figures
- Removing and installing sealing flange (front) · 1 torque figures
- Removing and installing thermostat · 2 torque figures
- Removing and installing vibration damper · 3 torque figures
- Removing and installing bracket for ancillaries · 2 torque figures
- Removing and installing cylinder head cover
- Removing and installing exhaust manifold
- Removing and installing intake manifold
- Removing and installing fuel tank with attached components
- Separating centre and rear silencers · 5 torque figures
- Removing and installing coolant pipe
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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.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.