The 1.9-liter Volkswagen AHU 1.9 TDI diesel engine was produced from 1996 to 2001 and was installed on many popular concern cars, but is mainly known for the Passat B5. This unit is essentially a slightly updated version of the well-known diesel under the 1Z index.
EA180 family: 1Z, AFN, AHF, AHU, ALH, AVG, AKU, AEY.
Specifications
| Production years | 1996-2001 |
| Displacement, cc | 1896 |
| Fuel system | direct injection |
| Power output, hp | 90 |
| Torque output, Nm | 202 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 79.5 |
| Piston stroke, mm | 95.5 |
| Compression ratio | 19.5 |
| Features | SOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | yes |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 4.3 |
| Fuel type | diesel |
| Euro standards | EURO 2 |
| Fuel consumption, L/100 km (for VW Passat 1998) — city — highway — combined |
7.0 4.3 5.3 |
| Engine lifespan, km | ~430 000 |
The engine was installed on:
- Audi A4 B5 (8D) in 1996 – 2001;
- Audi A6 C4 (4A) in 1996 – 1997;
- Seat Cordoba 1 (6K) in 1996 – 1999;
- Seat Ibiza 2 (6K) in 1996 – 1999;
- Seat Toledo 1 (1L) in 1996 – 1999;
- Volkswagen Caddy 2 (9K) in 1996 – 2000;
- Volkswagen Golf 3 (1H) in 1996 – 1997;
- Volkswagen Passat B5 (3B) in 1996 – 2000;
- Volkswagen Polo 3 (6N) in 1997 – 1999;
- Volkswagen Sharan 1 (7M) in 1996 – 2000;
- Volkswagen Vento 1 (1H) in 1996 – 1998.
Disadvantages of the VW AHU engine
- Most of the complaints are about dips in traction due to contamination of the turbine valve or EGR;
- Antifreeze leaks are also common due to a cracked cooling tee;
- The lower flange of the crankcase ventilation tube also periodically bursts and grease oozes through the sump;
- At high mileage, valve seats often burn out and the engine loses compression;
- A broken ribbed belt here can get into the timing and the engine will end.
Frequently asked questions about the Volkswagen AHU
How much power does the Volkswagen AHU make?
The Volkswagen AHU develops 90 hp and 202 Nm of torque.
How much oil does the Volkswagen AHU take and which one?
Engine oil capacity: 4.3 liters. Recommended oil: 5W-40.
Does the Volkswagen AHU have a timing belt or chain?
The Volkswagen AHU uses a timing belt.
Is the Volkswagen AHU turbocharged?
Yes, the Volkswagen AHU is turbocharged.
Does the Volkswagen AHU need valve clearance adjustment?
No, the Volkswagen AHU has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Volkswagen AHU last?
The typical lifespan of the Volkswagen AHU is ~430 000 km with proper maintenance.
What is the fuel consumption of the Volkswagen AHU?
VW Passat 1998: city 7.0, highway 4.3, combined 5.3 L/100 km.
What cars was the Volkswagen AHU installed on?
Audi A4 B5 (8D) in 1996 - 2001; Audi A6 C4 (4A) in 1996 - 1997; Seat Cordoba 1 (6K) in 1996 - 1999; Seat Ibiza 2 (6K) in 1996 - 1999; Seat Toledo 1 (1L) in 1996 - 1999; Volkswagen Caddy 2 (9K) in 1996 - 2000 and 5 more (see the full list above).
What are the common problems of the Volkswagen AHU?
Most of the complaints are about dips in traction due to contamination of the turbine valve or EGR. Antifreeze leaks are also common due to a cracked cooling tee. All known problems.
