Below the steering wheel. It will have 16-pin but not OBD2 compliant. You will need an adapter to convert the to OBD2. The engine (presumably) Mitsubishi 4G15 Efi which originally 12-pin. Proton did not use 12-pin but maintain the 16-pin where 4 pins are not used.
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The OBD2 port on a 1999 Proton Wira is usually located under the dashboard on the driver's side. You may need to look near the steering column or under the glove compartment to find it. It is usually a trapezoidal-shaped connector that is used for diagnostics and connecting scan tools.
In a Proton Wira, the fuse box is typically located under the dashboard on the driver's side. It may be a rectangular or square-shaped box with a cover that can be easily removed to access the fuses. Refer to your owner's manual for the exact location of the fuse box in your vehicle.
The best fuel for a 4G93 DOHC 16 Valve engine is typically premium unleaded gasoline with an octane rating of 91 or higher. Using higher octane fuel can help optimize engine performance and prevent knocking or pinging. It is advisable to refer to the manufacturer's recommendations for specific fuel requirements.