Produced from 1996 to 2001, the 1.9-liter Volkswagen AHU 1.9 TDI diesel engine was found in many well-known concern vehicles, but it is primarily recognized for the Passat B5. Under the 1Z index, this unit is basically a slightly modified version of the popular diesel.
1Z, AFN, AHF, AHU, ALH, AVG, AKU, and AEY are further models in the EA180 series.
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
Traction dips caused by turbine valve or EGR contamination account for the majority of complaints.
A cracked cooling tee is another common cause of antifreeze leaks;
Additionally, grease leaks through the sump when the lower flange of the crankcase ventilation tube occasionally bursts;
High mileage frequently results in valve seat burnout and engine compression loss;
This is where a damaged ribbed belt could enter the timing and cause the engine to stop.
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