Audi 2.4 V6 petrol engines used in A4 and A6 models, specifically the APS, ACK, and AAH engine codes. These are all part of Audi’s naturally aspirated V6 engine family, with subtle differences in tuning and application across model years.
🔧 Overview: Audi 2.4 V6 Engines (APS / ACK / AAH)
| Spec | Detail |
|---|---|
| Displacement | 2.4 litres (2393cc) |
| Configuration | V6, 90°, naturally aspirated |
| Valvetrain | DOHC – 30 valves (5 valves per cylinder) |
| Fuel System | MPI (multi-point injection) |
| Drive | FWD or Quattro |
| Common Transmissions | 5/6-speed manual or 5-speed Tiptronic automatic |
| Typical Vehicles | Audi A4 B5/B6, Audi A6 C4/C5, Audi A8 D2 (AAH) |
🔩 Engine Code Comparison
| Engine Code | Power | Torque | Years | Notes |
|---|---|---|---|---|
| AAH | 128 kW (174 hp) | 230 Nm | 1992–1997 | Early version, found in Audi 100/A6 C4, A4 B5 |
| ACK | 121 kW (165 hp) | 230 Nm | 1997–2000 | Found in Audi A6 C5, A4 B5 – detuned AAH with emissions mods |
| APS | 125 kW (170 hp) | 230 Nm | 2000–2004 | Updated version used in later A4 B6 / A6 C5 |
✅ These are all non-turbo petrol engines, known for smoothness but moderate power output and timing belt-driven designs.
🛠️ Known Strengths & Weaknesses
✅ Strengths
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Smooth and refined V6 performance
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Long service life with proper maintenance
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Excellent build quality (for pre-FSI era)
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Compatible with many VW/Audi platforms
⚠️ Common Issues
| Problem | Notes |
|---|---|
| ⛓️ Timing belt failure | Replace every 90,000–120,000 km with tensioners |
| 💧 Oil leaks | Valve cover gaskets & cam seals |
| 🔧 Idle control valve issues | Can cause surging or rough idle |
| 🔥 Coil packs / ignition system | May cause misfires |
| 💨 MAF sensor failure | Results in power loss and poor fuel economy |
🔧 Swapping or Replacing
If you’re replacing one of these engines:
| Original Engine | Possible Direct Replacements |
|---|---|
| AAH | AAH, ACK (with ECU adjustments) |
| ACK | ACK, APS (confirm ECU and immobiliser compatibility) |
| APS | APS, newer BDV (2.4 30v) with tuning |
✅ Important: These swaps are easiest within the same generation (e.g. A4 B5 to B5, A6 C5 to C5), especially to avoid ECU/immobiliser mismatch.
⚙️ Transmission Compatibility
| Gearbox Type | Code (Typical) | Notes |
|---|---|---|
| Manual 5/6-speed | 012, 01E | Direct fit for most V6s |
| Tiptronic Auto | 01V | Common in A6 C5 2.4 |
| CVT Multitronic | Not ideal for engine swaps (less durable) |
📍 Where to Source These Engines
🇿🇦 South Africa
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Local engine importers (Engine Den, S&G, Majestic)
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Gumtree / OLX / Facebook Marketplace – Used units
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Scrap yards – Many 2.4 V6 engines are pulled from A4/A6 trade-ins
🌍 International
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UK / Germany / Poland – Strong Audi used parts network
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UAE (Sharjah) – Good source for complete used engines
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Japan (JDM stock) – Some used clean low-km engines available
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