Yes. The Lexus IS250 can be started with a key, depending on whether your car uses a traditional ignition cylinder or a smart-key system, and on the model year.
Most IS250 models from the mid-2000s to early 2010s offered two common configurations: a conventional ignition that accepts a physical key, and a modern Smart Key system with a Start/Stop button. The steps differ, and some later trims or markets used push-button start with a keyless fob. The following sections outline how to start in each scenario.
Traditional ignition key
Follow these steps if your IS250 uses a conventional ignition cylinder and a physical key.
- Enter the vehicle and ensure the gear selector is in Park (P) with your foot on the brake.
- Insert the physical key into the ignition cylinder.
- Turn the key to the Start position and hold briefly until the engine turns over, then release.
- Let the engine run and remove your hand from the key once the engine is running.
- If the engine does not start after a few seconds, check the battery, fuses, and immobilizer status, or seek professional assistance.
With a traditional key, starting is straightforward as long as the car’s battery and immobilizer system recognize the key and the vehicle is in Park.
Smart Key / Push-Button Start
Use these steps if your IS250 is equipped with a Smart Key system and a Start/Stop button.
- Make sure the key fob is inside the vehicle (in your pocket or bag).
- Depress the brake pedal firmly.
- Press the Start/Stop button once to start the engine.
- Allow the engine to run and remove your foot from the brake once it starts.
- If the engine does not start, check the key fob battery and ensure the fob is detected inside the car. Some models offer an emergency method with a mechanical key blade inside the fob; consult the owner’s manual for the exact location and procedure.
The smart-key system relies on the presence of an active fob; a dead fob battery or poor detection can prevent starting. Replacing the fob battery or using any manufacturer-provided emergency method will typically resolve this.
Summary
Bottom line: You can start an IS250 with a key, either through a traditional ignition key or via a smart-key Start/Stop system, depending on the model year and trim. If you’re unsure which method applies to your car, check the owner's manual or contact a Lexus dealer for model-specific instructions and safety guidance.