AEX engine — VW 1.4 (1.4L)
1.4L · 60 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | AEX |
| Capacity | 1390 cc |
| Idle speed | 770 - 970 rpm |
| Automatic | 750 - 850 rpm |
| Normal | 10 - 15 bar |
| Minimum | 7 bar |
| Differential limit between cylinders | 3 bar |
| Oil pressure | 2.0 / 2000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic MP9.0 |
| Number of cylinders | 4 |
| Firing order | 1 - 3 - 4 - 2 |
| Timing stroboscopic (before TDC) | 6 ± 1 °/rpm |
| Ignition coil resistance, primary | 0.5 - 1.2 ohms |
| Ignition coil resistance, secondary | 3000 - 4000 ohms |
| Spark plugs (make and type) | NGK BUR 6ET Beru 14GH-7DTUR Bosch W7LTCR |
| Spark plug gap | 0.7 - 0.9 Bosch: 0.9 - 1.1 mm |
| Fuel pump pressure | 3.0 bar |
| CO exhaust gas | < 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: | 670 - 1070 rpm |
| Conditioning catalytic converter | 2 min |
Cooling system
| Cap pressure | 1.4 - 1.6 bar |
| Thermostat opens at | 84 - 98 °C |
| Stage 1/Fan 1 | 92 - 97 °C |
| Stage 2/Fan 2 | 99 - 105 °C |
Electrical
| Battery | 36 / 44 Ah |
| Alternator | 70 / 90 A |
Capacities
| Engine sump, incl. filter | 3.2 l |
| Manual transmission | 085 |
| Gearbox refill | 3.1 (> 10/1995) 2.7 (10/1995 >) l |
| Plug location | (> 10/1995) |
| Plug location | (10/1995 >) |
| Cooling system | 5.6 l |
| Air-conditioner refrigerant | 700 - 750 g |
| Air-conditioner compressor oil | 135 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 40 Nm |
| Cylinder head bolts — Stage 2 | 60 Nm |
| Cylinder head bolts — Stage 3 | 90 ° |
| Cylinder head bolts — Stage 4 | 90 ° |
| Cylinder head bolts — Stage 1 | 30 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Wheel nuts | 110 Nm |
| Spark plugs | 25 Nm |
| Big-end bearing cap | M8: 30 Nm + 90° M7: 20 Nm + 90° Nm |
| Oil plug | 30 Nm |
| Oxygen sensor | 55 Nm |
| Flywheel | 60 Nm + 90° Nm |
Emissions
| Emission code | 70/220*1996/69 |
| Emission standard | Euro 2 (03/1999 ->) |
| CO2 average | 146 - 156 g/km |
| CO | 0.157 - 0.584 g/km |
| HC NOx | 0.065 - 0.283 g/km |
| Emission code | 70/220*1998/69 |
| Emission standard | Euro 2 (06/1999 ->) |
| CO2 average | 146 g/km |
| CO | 0.251 g/km |
| HC | 0.043 g/km |
| NOx | 0.023 g/km |
| Emission code | 70/220*1999/102B |
| Emission standard | Euro 4 (08/2000 ->) |
| CO2 average | 154 g/km |
| CO2 average | 187 - 190 g/km |
| CO | 0.173 - 0.743 g/km |
| HC NOx | 0.064 - 0.236 g/km |
| CO2 average | 182 - 185 g/km |
| CO | 0.310 g/km |
| HC | 0.062 g/km |
| NOx | 0.019 g/km |
| Emission standard | Euro 2 |
| CO2 average | 151 g/km |
| CO | 0.584 g/km |
| HC NOx | 0.242 g/km |
| CO2 average | 151 - 156 g/km |
| HC NOx | 0.065 - 0.242 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.
- Checking function and voltage supply – VW Polo 6R
- Checking throttle valve control part
- Dismantling and assembling engine
- Servicing valve gear
- Fitting locations overview
- Removing and installing parts of the injection system
- Removing and installing parts of the lubrication system
- Dismantling and assembling pistons and conrods
- Checking lines to fuel tank and fuel cap
- Removing and installing fuel tank with its attachments
- Removing and installing parts of exhaust system
- Checking Lambda probe and Lambda control
- Checking air conditioner and air conditioner compressor signals
- Checking intake manifold pressure sender
- Dismantling and assembling cylinder block, crankshaft and flywheel
- Checking intake air system for leaks (unmetered air)
- Checking engine operating mode
- Connecting fault reader V.A.G 1551 and selecting engine control unit
- Testing speed signal
- Dismantling and assembling air cleaner
- Checking Lambda probe heating
- Checking ignition transformer and output stage
- Vehicles with chain driven oil pump
- Dismantling and assembling intake manifold
- Removing and installing parts of the ignition system
Got a AEX problem? Ask for free.
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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.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.