two iconic 2.0-liter turbocharged engines from the Volkswagen Audi Group (VAG) used in the Audi A4 and other models — engine codes AUM and AUQ. However, there’s a clarification to make:
🔧 AUM and AUQ are 1.8T 20V engines, not 2.0L.
These engines are 1.8-liter inline-4 turbocharged petrol engines, well-known for their performance and tuning capability, especially in early-2000s VAG vehicles.
Let’s break them down:
🔩 AUM vs. AUQ – 1.8T 20V Engine Comparison
| Feature | AUM | AUQ |
|---|---|---|
| Displacement | 1.8L (1781cc) | 1.8L (1781cc) |
| Valvetrain | DOHC 20V | DOHC 20V |
| Turbo | K03s | K03s |
| Boost Control | Electronic N75 valve | N75 valve (similar setup) |
| Power Output | 150 hp (110 kW) | 180 hp (132 kW) |
| ECU | ME7.5 (Drive-by-wire) | ME7.5 (Drive-by-wire) |
| Fuel Injection | Bosch Motronic EFI | Bosch Motronic EFI |
| Intercooler | Front-mount | Front-mount |
| Emission Std. | Euro 4 | Euro 4 |
| VVT | Yes (inlet cam only) | Yes |
| Vehicles | Golf 4 GTI, Audi A3 8L, Leon 1M | Golf 4 GTI, A3 8L, TT 180hp, Octavia RS |
✅ Performance & Tuning
| Aspect | Notes |
|---|---|
| 🔧 Remapping Potential | Both easily remapped to 190–210 hp |
| 🔩 Bolt-on Upgrades | FMIC, exhaust, injectors, K04 turbo |
| 🧰 Internals | Good for ~220–250 hp on stock pistons |
| ⚙️ Common Mods | 3″ downpipe, upgraded N75, VR6 clutch |
| 🔥 K04-023 upgrade | Brings them to 240–260+ hp with supporting mods |
⚠️ Common Issues
| Problem | Notes |
|---|---|
| ❌ Coil packs failing | Causes misfires, loss of power |
| 💧 Oil leaks | From cam seals, valve cover, turbo return |
| 🔄 Diverter valve | Tears in diaphragm cause boost leaks |
| 💨 MAF sensor failures | Affect throttle response and AFR |
| ⛓️ Timing belt | Must be replaced every 90,000–120,000 km |
📦 Swapping These Engines
You can swap AUM ↔ AUQ with little effort if:
-
You use matching ECU, immobilizer, and wiring
-
Confirm turbo oil feed/return lines
-
Match gearbox mountings (02J, 02M, etc.)
🛠️ Audi A4 (B6/B7) normally came with longitudinal engines, so AUM/AUQ (transverse) are not drop-in for A4 without serious modification.
❓ Did You Mean the 2.0L Engines?
If you were referring to a 2.0L engine in the Audi A4, here are possibilities:
| Code | Type | Notes |
|---|---|---|
| ALT | 2.0 NA 8V | Common A4 B6 engine |
| BWE / BPJ / BUL | 2.0T FSI | Found in A4 B7 2.0T |
| CAEB | 2.0 TFSI | A4 B8 generation |
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