The Saab 9-3 Aero is a compact executive car that was produced by Saab from 1998 until 2003. Being a 2003 model, your Saab 9-3 Aero likely features a turbocharged 2.0-liter four-cylinder engine.

Given that you haven't specified any particular question, I can provide you with some general information about the Saab 9-3 Aero 2003 model. If you have any specific concerns or questions regarding the car's mechanics or maintenance, feel free to ask.

Here are some key points about the Saab 9-3 Aero 2003:

1. Engine: The 2003 Saab 9-3 Aero is equipped with a 2.0-liter four-cylinder engine that features turbocharging. This engine delivers a considerable amount of power and torque, providing a sporty driving experience.

2. Turbocharging: The turbocharged engine in the Saab 9-3 Aero helps increase power output by forcing more air into the engine's combustion chambers. This results in improved performance and acceleration.

3. Transmission: The 2003 Saab 9-3 Aero typically comes with a five-speed manual transmission as standard. However, there is also an option for a five-speed automatic transmission.

4. Suspension and Handling: Saab vehicles are known for their excellent handling characteristics, and the 9-3 Aero is no exception. It features a sport-tuned suspension, which provides a more responsive and balanced ride.

5. Safety Features: Saab vehicles, including the 9-3 Aero, have a strong focus on safety. In 2003, the 9-3 Aero was equipped with standard safety features such as anti-lock brakes (ABS), traction control, stability control, and multiple airbags.

6. Maintenance: Regular maintenance is essential to keep any car in good working condition. It is recommended to follow the maintenance schedule provided in the owner's manual. This includes regular oil changes, filter replacements, tire rotations, and inspections of the brakes, suspension, and exhaust system. It's also important to keep an eye on fluid levels, including coolant, brake fluid, and transmission fluid.

7. Common Issues: Although the Saab 9-3 Aero 2003 is well-regarded, it's always good to be aware of potential problems. Some common issues reported by owners include electrical problems (such as window regulator failures), clutch and flywheel wear, ignition-related issues, and oil sludge build-up in the engine if oil changes were neglected. Regular maintenance and addressing any issues promptly can help minimize these problems.

Remember, the information provided here is based on general knowledge about the Saab 9-3 Aero 2003 model. For specific and accurate information about your vehicle, consult the owner's manual or seek advice from a professional mechanic.