You can use a Bluetooth or Wi‑Fi OBD2 adapter and a phone app to read engine codes on most 1996+ vehicles.

1. Confirm your vehicle supports OBD2 (most cars and light trucks 1996 and newer).
2. Locate the OBD2 port (usually under the dash near the steering column) and plug in the adapter.
3. Turn the ignition to ON (engine off), unless your adapter’s instructions say otherwise.
4. Install and open the adapter’s companion app, then pair your phone and connect.
5. Select “Read Codes” to view stored and pending trouble codes, and save reports if needed.

• Use the tool while parked and remove the adapter when done to avoid battery drain.
• Clearing codes may reset monitors; professional diagnosis can help interpret results.

You can pull Diagnostic Trouble Codes (DTCs) with a basic code reader or a smartphone adapter.

1. Park safely, turn the ignition to ON, and plug a reader into the OBD2 port.
2. Follow on-screen prompts to “Scan” or “Read Codes.”
3. Record the alphanumeric codes (for example, P0xxx) and the brief descriptions.

• Check “freeze frame” or live data if available to see what the engine was doing when the code set.
• A DTC points to a system or circuit, not always a specific part; additional testing may be helpful.
• If you clear codes, some readiness monitors may reset. For emissions testing, allow normal driving to complete monitors before checking again.

Handheld code readers are plug‑and‑play tools designed to read and clear basic OBD2 codes.

1. With the vehicle parked, locate the OBD2 port under the dash and connect the reader.
2. Turn the ignition to ON (engine off) so the tool can power up and communicate.
3. Use the menu to select “Read Codes” for stored and pending DTCs.
4. View or save results; some readers also show live data or I/M readiness.
5. If you choose to clear codes, re-scan after a short drive to see what returns.

• Note any codes before clearing to help with diagnosis.
• Features vary by model; reviewing the user guide can improve results and usability.

Compatibility depends on the vehicle and the tool’s coverage.

• Most cars and light trucks from 1996 and newer support OBD2 for engine/transmission codes.
• Heavy‑duty trucks and diesel applications may require tools that support additional protocols; check product specs for coverage.
• Motorcycles and powersports often use brand‑specific connectors or adapters; confirm the tool supports your model.
• Advanced functions (like ABS/SRS access, service resets, or bi‑directional tests) vary by make and model—review the tool’s compatibility list.
• You’ll find both handheld and Bluetooth options online and in stores at Walmart.

Verifying your vehicle’s year, system needs, and the scanner’s feature list before purchase can help you pick the right fit.

The OBD2 port is usually within easy reach of the driver.

• Most commonly, it’s under the dashboard near the steering column or above the pedals.
• It may sit behind a small cover near the fuse panel.
• Occasionally, it’s near the center console or passenger side.

Look for a 16‑pin, trapezoid‑shaped connector. A flashlight helps, and the owner’s manual often shows the exact spot. Avoid forcing panels or connectors. Once you find it, plug in your code reader while the vehicle is parked with the parking brake set. If you still can’t locate the port, a service professional can point it out and help you get started safely.