Plug in, read codes, and understand what your car is trying to tell you. Professional-level OBD2 diagnostics at a fraction of the shop price.
From budget code readers to professional-grade scan tools â find the perfect diagnostic solution for your needs.
The perfect entry-level scanner for reading and clearing check engine lights. Bluetooth connected to our free mobile app for instant code definitions and repair hints.
Professional-grade handheld scanner with a built-in color touchscreen. Access all vehicle systems â engine, transmission, ABS, airbags, and more. Bi-directional controls let you actively test components.
Diagnose AND tune. This powerhouse reads codes, graphs live data, and supports ECU remapping for select vehicles. Monitor up to 8 parameters simultaneously with custom alert thresholds.
Search thousands of diagnostic trouble codes with plain-English explanations and common repair solutions.
Don't panic. Enter the code below and we'll tell you exactly what it means, how serious it is, and the most common fixes based on real repair data from our community of 50,000+ DIY mechanics.
| Code | Description | Severity | Common Cause | Est. Repair Cost |
|---|---|---|---|---|
| P0171 | System Too Lean (Bank 1) | Moderate | Vacuum leak, dirty MAF sensor | $50â$200 |
| P0300 | Random/Multiple Cylinder Misfire | High | Spark plugs, coils, fuel injectors | $150â$600 |
| P0420 | Catalyst System Efficiency Below Threshold | Moderate | Failing catalytic converter, O2 sensor | $300â$1,200 |
| P0128 | Coolant Thermostat Below Regulated Temperature | Low | Stuck-open thermostat | $100â$250 |
| P0442 | EVAP System Small Leak Detected | Low | Loose gas cap, EVAP hose leak | $20â$150 |
| P0455 | EVAP System Large Leak Detected | Moderate | Broken EVAP line, faulty purge valve | $75â$300 |
| P0700 | Transmission Control System Malfunction | High | Transmission solenoid, TCM issue | $200â$800 |
| C0035 | Left Front Wheel Speed Sensor Circuit | High | Failed wheel speed sensor | $150â$400 |
From check engine light to root cause in four simple steps.
Connect your scanner to the OBD2 port â usually found under the dashboard near the steering wheel.
Turn the ignition on and let the scanner communicate with your vehicle's computer to retrieve stored codes.
Use our app or code lookup tool to understand what each code means and identify the root cause.
Fix the issue, then use the scanner to clear the codes and turn off the check engine light.
Find the right diagnostic tool for your skill level and budget.
| Feature | Scanner Lite | AutoScan Pro X5 | Tuner Ultimate |
|---|---|---|---|
| Price | $29.99 | $199.99 | $349.99 |
| Connection | Bluetooth | Wired + WiFi | Wired + WiFi + BT |
| Read/Clear Engine Codes | â | â | â |
| All-System Scan | â | â | â |
| Bi-Directional Controls | â | â | â |
| Live Data Graphing | â | â | â |
| ECU Tuning | â | â | â |
| Free App | â | â | â |
| Lifetime Updates | â | â | â |
| Action | Buy Now | Buy Now | Buy Now |
Everything you need to know about automotive diagnostics and OBD2 scanners.
OBD2 (On-Board Diagnostics) is a standardized system used in all vehicles manufactured since 1996. An OBD2 scanner plugs into your car's diagnostic port and reads trouble codes stored in the vehicle's computer. If you want to understand check engine lights, diagnose problems before they get worse, or save money on shop visits, a scanner is the most valuable tool you can own.
The OBD2 port is typically located under the dashboard on the driver's side, within reach of the steering wheel. It's a 16-pin trapezoidal connector. In some vehicles, you may find it near the center console, in the glove box, or in the trunk. Check your vehicle's owner's manual for the exact location.
Technically yes, but it's not recommended. Clearing a code without fixing the underlying issue is like putting a band-aid on a broken bone. The check engine light will likely come back, and the underlying problem could worsen â potentially leading to expensive damage. Always diagnose the root cause before clearing codes.
We recommend starting with the OBD2 Smart Scanner Lite ($29.99). It reads and clears engine codes, connects to your phone via Bluetooth, and works with our free app that provides code definitions and repair hints. As you gain experience, you can upgrade to the AutoScan Pro X5 for all-system scanning and advanced features.
Yes! All OBD2 scanners work on any vehicle with an OBD2 port â including Japanese, European, and Korean vehicles from 1996 onwards. However, some manufacturer-specific codes may require our higher-end scanners (AutoScan Pro X5 or Tuner Ultimate). For trucks, RVs, and heavy-duty diesel vehicles, the Pro X5 offers enhanced J1939 protocol support.
No! Our core diagnostic app is completely free with every scanner purchase. It includes code reading, clearing, live data, and repair hints. We offer an optional premium subscription ($4.99/mo) that adds advanced features like guided repairs, video tutorials, and cloud report sharing â but it's never required to use the basic diagnostic functions.
Whether it's a check engine light or a strange noise, get the tools and knowledge to figure it out yourself. Save hundreds on every visit to the shop.