In a 1991 Hyundai Excel, the computer chip, often referred to as the engine control unit (ECU), is typically located inside the vehicle, near the driver's side kick panel or under the dashboard. It may be housed in a plastic case and connected to various wiring harnesses. To access it, you might need to remove some trim or panels for better visibility. Always consult the vehicle's service manual for specific instructions related to your model.
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