The OBD-II diagnostic port on a 1999 Honda Accord is located under the driver’s side dashboard, to the left of the steering column, behind a small access panel near knee level.
In 1999, Hondas used the standard OBD-II interface (a 16-pin connector) for engine and emissions diagnostics. Accessing the port is straightforward from the driver's seat, typically without tools, though you may need to remove a small cover.
Location and access
The port is usually on the lower portion of the driver’s side dash, just above the pedals. It sits behind a removable cover that may be labeled “OBD” or simply be an unmarked hatch.
To locate and access it, follow these steps:
- With the ignition off, sit in the driver’s seat and look toward the left side of the steering column, near the knee area.
- Gently pry open the small rectangular panel or door in the lower dash to reveal the 16-pin OBD‑II receptacle.
- Connect your scanner’s plug, ensuring correct orientation, and proceed per the scanner’s instructions.
- If your scanner requires power, power it from the device; do not start the engine unless your scanner instructions explicitly call for it.
If you don’t see the panel immediately, it may be tucked beside the fuse block or just below the steering column. Check your owner’s manual for a model-specific diagram.
Notes and safety tips
Handle the cover and connector gently to avoid damage. Keep the engine off while locating the port, and follow safety guidelines provided with your diagnostic tool.
Summary: For a 1999 Honda Accord, the OBD-II port is located under the driver’s side dash, to the left of the steering column, behind a knee-level access panel. It is a 16-pin connector used for standard diagnostics and emissions testing.