B204S engine — Saab 2.0 (2L)
2L · 150 hp
Engine overview
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | B204S |
| Capacity | 1985 cc |
| Idle speed | 850 ± 50 rpm |
| Oil pressure | < 2.7/2000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Saab Trionic |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Spark plugs (make and type) | NGK BCPR 7 ES |
| Spark plug gap | 1.0 +0.1/-0.2 mm |
| Injection pressure/system pressure | 3.0 +0.25/-0.15 bar |
| CO exhaust gas | < 0.5 % |
| CO2 | 14.5 - 16.0 % |
| HC | 100 ppm |
| O2 | 0.1 - 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: | 600-1200 rpm |
Cooling system
| Cap pressure | 0.9 - 1.2 bar |
| Thermostat opens at | 89 ± 2 °C |
| Stage 1/Fan 1 | ( - 09/1994): 90 (09/1994 - ): 100 °C |
| Stage 2/Fan 2 | ( - 09/1994): 106 (09/1994 - ): 111 °C |
Electrical
| Battery | 60 Ah |
| Alternator | 80 A |
Capacities
| Engine sump, incl. filter | 4.2 l |
| Gearbox refill | 1.8 l |
| Gearbox refill | 3.0 - 3.5 l |
| Cooling system | 9.0 l |
| Air-conditioner refrigerant | 950 g |
| Air-conditioner compressor oil | 135 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 60 Nm |
| Cylinder head bolts — Stage 2 | 80 Nm |
| Cylinder head bolts — Stage 3 | +90° ° |
| Front hub | 290 Nm |
| Rear hub | 290 Nm |
| Wheel nuts | 120 Nm |
| Spark plugs | 28 Nm |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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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.