1. Overview
This diagnostic tool is specially designed to work with all OBD II compliant vehicles, including Controller Area Network (CAN). It provides comprehensive diagnostic functions for various vehicle systems and offers multiple reset services.
1.1 Key Features
- 4 System Diagnostic: Engine, Transmission, ABS, Airbag (SRS) systems.
- 7 Reset Services: Oil Lamp Reset, EPB Reset, Steering Angle Calibration, Battery Matching, ABS Bleeding, D.P.F Regeneration, Throttle Relearn.
- Full OBD2 Functions: Supports all 10 test modes for OBD-II cars.
- Auto-VIN Smart Diagnostic: Quickly identifies vehicle information.
- Lifetime Free Update: Online updates via Wi-Fi to keep software current.
- Multi-Language Support: 11 languages available.
- Battery Voltage Test: Monitors vehicle battery in real-time.
- Data Management: 4-in-1 Live Data Stream Graph, Diagnostic Report, Online Diagnostic Feedback, Email Share, Data recording and playback, Screenshot, DTC lookup.
- CAN FD Protocols Support: Enhanced compatibility.

Figure 1: LAUNCH X431 CRP123E V3.0 with key features highlighted.

Figure 2: System Diagnostic Capabilities.

Figure 3: Available Reset Services.
2. Safety Precautions and Warnings
To prevent personal injury or damage to vehicles and/or the tool, read this user's manual carefully and observe the following safety precautions at a minimum whenever working on a vehicle:
- There are no user serviceable parts. Have the device serviced by a qualified repair person using only identical replacement parts. Disassembling the device will void the warranty.
- Caution: This tool contains an internal Lithium Polymer battery. The battery can burst or explode, releasing hazardous chemicals. To reduce the risk of fire or burns, do not disassemble, crush, pierce or dispose of the battery in fire or water.
- This product is not a toy. Do not allow children to play with or near this item.
- Do not expose the device to rain or wet conditions.
- Do not place the device on any unstable surface.
- Never leave the device unattended during charging process. The device must be placed on a non-flammable surface during charging.
- Handle the device with care. If the device is dropped, check for breakage and any other conditions that may affect its operation.
- Do not operate the tool in explosive atmospheres, such as in the presence of flammable liquids, gases, or heavy dust.
- Keep the tool dry, clean, and free of oil, water or grease. Use a mild detergent on a clean cloth to clean the enclosure of the device when necessary.
- People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to heart pacemakers could cause pacemaker interference or pacemaker failure.
- Always perform automotive testing in a safe environment.
- Do not attempt to operate or observe the tool while driving a vehicle. Operating or observing the tool will cause driver distraction and could cause a fatal accident.
- Wear safety eye protection that meets ANSI standards.
- Keep clothing, hair, hands, tools, test equipment, and other objects away from all moving or hot engine parts.
- Operate the vehicle in a well-ventilated work area. Exhaust gases are poisonous.
- Chock the drive wheels and never leave the vehicle unattended while running tests.
- Use extreme caution when working around the ignition coil, distributor cap, ignition wires and spark plugs. These components create hazardous voltages when the engine is running.
- Put the transmission in P (for A/T) or N (for M/T) and make sure the parking brake is engaged.
- Keep a fire extinguisher suitable for gasoline/chemical/electrical fires nearby.
- Don't connect or disconnect any test equipment while the ignition is on or the engine is running.
3. Product Description
3.1 Components & Controls

Figure 4: Device Layout and Main Menu.
- Charging LED: Red indicates charging, Green indicates fully charged.
- LCD: Displays test results and user interface.
- USB Type-C port: For connecting the charging cable.
- DB-15 Diagnostic Connector: For connecting to the vehicle's DLC.
- Power Button: To turn the tool on or off.
3.2 Technical Specifications
| Attribute | Specification |
|---|---|
| Screen Size | 5-inch, 1280*720P Touch Screen |
| Android Version | Android 8.1 |
| Battery Capacity | 3.7V/6000mAh |
| RAM | 2 GB |
| Storage | 32 GB (System shows 25.9GB) |
| CPU | 1.3GHz Quad-Core |
| OBDII Input Voltage Range | 9~18V |
| Charging Method | Charging cable or diagnostic cable through vehicle's DLC |
| Update Method | Online Update via Wi-Fi |
| Main Cable Interface | DB15 (Dual Row) → OBDII 16PIN |
| Wi-Fi | Yes |
| Bluetooth | No |
| Dimensions | 228 mm x 125 mm x 34 mm |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Storage Temperature | -20°C to 70°C (-4°F to 158°F) |
| Charging Temperature | 0°C to 40°C (32°F to 104°F) |
Note: The operating temperature refers to the temperature at which the scan tool works normally in non-charging status.
3.3 Packing List
The following packing list is for reference only. For details, consult the seller or check the packing list supplied with this tool together.
- Diagnostic tool x 1
- OBD II diagnostic cable x 1
- Charging cable x 1
- User manual x 1
- Carrying bag x 1

Figure 5: Package Contents.
4. Initial Use (Setup)
4.1 Charging the Tool
There are two charging methods available:
- Via Charging Cable: Plug one end of the included charging cable into the Type-C port of the tool, and the other end to an external power supply device.
- Via Diagnostic Cable: Insert one end of the diagnostic cable into the DB-15 connector of the tool, and the other end to the vehicle's DLC.
Once the charging LED illuminates solid green, it indicates that the battery is fully charged.
4.2 Getting Started
If it is the first time you have used this tool, you need to make some system settings:
- Press the power button to power it on.
- The screen displays a welcome page. Tap Start to go to the next step.
- Choose the desired system language, and tap Next step.
- Choose the desired time zone, and tap Next step to enter the WLAN setup screen.
- Slide the switch to ON; the system starts searching for all available wireless LANs. Choose the desired WLAN access point/network.
- If the selected network is open, you can connect it directly.
- If the selected network is encrypted, you have to enter the right security key (network password).
- After the network connection is done, tap Next step to configure workshop information. Input the required information, and tap Next step to proceed.
- Carefully read all terms and conditions of the user agreement, check the box before Agree to all the above terms, and tap OK to finish the sign-up process and navigate to the Job Menu.
4.3 Job Menu Overview
The main menu screen includes the following function modules:
| Module | Description |
|---|---|
| Local Diagnose | Configures the tool as a professional diagnostic tool. |
| Service Function | Offers coding, reset, relearn, and other service functions to help vehicles return to functional status after repair or replacement. |
| Other Modules | Includes add-on modules that extend the functionalities of the diagnostic tool. |
| Upgrade | Updates vehicle diagnostic software and APK. Requires a stable network connection. |
| Mall | Allows subscription to extra vehicle diagnostic software or reset software not included within the tool. |
| Know Your Customer | Assists repair shops with business analysis, customer management, diagnosis statistics, and service ranking. |
| Mine | Checks saved reports, order information, and allows system settings. |
| Toolbox | Provides practical add-on modules including battery voltage, diagnostic software clear, firmware fix, DTC library, diagnostic record, DLC lookup, feedback, image, user manual, etc. |
| More | Includes Online support and LAUNCH Academy. |
5. Operation (Diagnose)
5.1 Vehicle Connection
- Turn the ignition off.
- Locate the vehicle's 16-pin Data Link Connector (DLC). The DLC is typically located 12 inches from the center of the instrument panel, under or around the driver's side for most vehicles. Refer to the vehicle's service manual if you cannot find it.
- Plug one end of the diagnostic cable into the vehicle's DLC port, and the other end to the DB-15 diagnostic connector of the tool. Tighten the captive screws.
- Turn the ignition on. The engine can be off or running.
- Press the power button for several seconds to turn the tool on and enter the Job Menu.
Caution: Do not connect or disconnect any test equipment while the ignition is on or the engine is running.
5.2 System Diagnostics
This function is designed to diagnose electronic control systems of a single vehicle model. Supported vehicle systems and diagnostic functions vary depending on product configurations.
5.2.1 Smart Diagnosis (Auto-Detect)
This function allows you to quickly access the electronic control systems of the vehicle by decoding the Vehicle Identification Number (VIN), without manual step-by-step menu selection.
- Set Automatic detection on connect to On in Mine -> Settings. After connection, turn the ignition key on, and the system enters auto-detect mode.
- Alternatively, tap Local Diagnose -> AutoDetect to start the smart diagnosis manually if Automatic detection on connect is Off.
Note: A highly stable network connection is recommended for successful VIN access. Not all cars support Auto-Detect due to manufacturer settings.
- If the system successfully obtains the VIN, confirm the information and tap OK to start diagnosing all available systems. A diagnostic report will be automatically generated.
- If the tool fails to access VIN information, you will be prompted to manually input the VIN.
5.2.2 Manual Diagnosis
If the tool cannot obtain or analyze the VIN information, you can perform vehicle diagnosis manually. In this mode, you need to execute menu-driven commands and follow on-screen instructions.
Note: Before diagnosing, ensure the corresponding vehicle manufacturer software has been installed. The diagnostic menu may vary by vehicle's make, model, and year.
5.2.3 Health Report (Quick Test)
This function quickly accesses all electronic control units (ECUs) of the vehicle and generates a detailed report about vehicle health. Tap Health Report on the test item selection screen to start scanning. Fault codes appear in red, and normally working systems are displayed in green.
5.2.4 OBDII Diagnostics
This option provides a quick way to check for DTCs, isolate the cause of the Malfunction Indicator Lamp (MIL), check monitor status, verify repairs, and perform other emission-related services.
- Read I/M Readiness: Checks if emissions-related systems are operating properly and ready for inspection.
- Read Live Data: Retrieves and displays live data and parameters from the vehicle's ECU.
- Read Freeze Frame: Captures operating conditions when an emission-related fault occurs.
- Read Fault Code: Displays detailed information of DTCs.
- Clear Fault Code: Erases codes from the vehicle after repairs. Ensure ignition is ON and engine is OFF before clearing.
- Test Results: On-Board Monitoring Test: Retrieves test results for non-continuously monitored powertrain components.
- Control Operation of On-Board Component/System: Accesses vehicle-specific subsystem and component tests.
- Read Vehicle Information: Retrieves VIN, Calibration ID (CID), and Calibration Verification Number (CVN).
- EU OBFCM: Monitors fuel and energy consumption data for CO2 emissions compliance.
5.3 Service Functions
The tool offers various service functions for vehicle maintenance. Available tests vary by vehicle manufacturer, year, and model. It is recommended to check for updates regularly.
To perform a reset operation:
- Select Service Function from the Job Menu.
- Choose the desired service function (e.g., Oil Reset, EPB Reset).
- Select the desired car brand.
- Select the reset mode (available modes vary by vehicle).
- Follow the on-screen instructions to proceed.
Video 1: Product demonstration showing various diagnostic and reset functions.
6. Toolbox Functions
The Toolbox module provides access to several utility functions:
- Battery Voltage: Measures the current voltage of the vehicle's battery.
- Diagnostic Software Clear: Deletes diagnostic software that is not frequently used.
- Firmware Fix: Upgrades and fixes diagnostic firmware. Do not cut power or switch interfaces during this process.
- DTC Library: Retrieves detailed descriptions of Diagnostic Trouble Codes (DTCs) from the database.
- Diagnostic Record: Stores running parameters or waveform graphs recorded by the user.
- DLC: Helps locate the vehicle's Data Link Connector.
- Feedback: Allows users to send diagnostic problems for analysis and troubleshooting.
- Image: Manages and shares screenshots.
- Product Manual: Provides a detailed operation manual for quick reference.
7. Software Upgrade
If new software or APK updates are available, a numeric indicator will display on the Upgrade module in the Job Menu. It is strongly recommended to update regularly for new functions and better service.
- Tap Upgrade on the Job menu to enter the update center.
- By default, all diagnostic software is selected. To deselect, tap Unselect and uncheck the desired vehicle model.
- Tap Update to start downloading. This may take several minutes. You can pause (Stop) and resume (Continue) the download. If network connection fails, tap Retry.
- Once downloaded, software packages will be installed automatically.
Note: The free subscription for default software has an expiration date. Renewal is required after expiration to continue receiving new diagnostic software and versions.
8. Settings
The Mine -> Settings module allows you to customize various system preferences:
- Units of measurement: Set to Metric System or English System.
- Screen capture: Enable/disable the screen capture icon.
- Automatic detection on connect: Determine whether to start automatic VIN detection upon connecting to the vehicle's DLC.
- Display/Brightness: Adjust standby time and screen brightness. (Reducing brightness conserves battery).
- Sound: Adjust volume and other sound settings.
- Network: Configure WLAN settings for registration, updates, and email.
- Time zone: Set the device's time zone.
- Language: Change the system language (English, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish are supported).
- Workshop information: Configure workshop details, which will be automatically added to diagnostic reports.
- Recovery: Reset the tool to default factory settings. (Warning: This may cause data loss).
- Clean up: Clear cache files and free up storage space.
- About: Displays hardware configuration and license agreement information.
9. User Tips
- TPMS Decoder: The tool supports TPMS reset functions, but a dedicated TPMS decoder might be an optional add-on available for purchase in the 'Mall' function if full TPMS system diagnostics are required beyond basic resets. Always check compatibility and required accessories for advanced functions.
- Vehicle Compatibility: The LAUNCH CRP123E Scanner supports passenger vehicles with OBD II interface input voltage of 9V~18V. It is not designed for 24V trucks or commercial vehicles; using it on such vehicles may damage the device.
- Troubleshooting Fault Codes: To successfully clear fault codes, you may need to repair the car first. Clearing codes without addressing the underlying issue will likely result in the codes reappearing.
- VIN Scan Issues: If the Auto VIN Scan function doesn't work for your vehicle, you can manually enter the VIN. Some older or specific vehicle models may not fully support automatic VIN detection.
10. Troubleshooting (FAQ)
This section addresses frequently asked questions and common issues.
- Q: The tool cannot connect to the vehicle.
A: Ensure the ignition is on, the diagnostic cable is securely connected to both the tool and the vehicle's DLC, and the vehicle is OBD II compliant. Check the DLC location in your vehicle's service manual if unsure. - Q: The tool fails to read the VIN automatically.
A: Not all vehicles support Auto VIN Scan. If automatic detection fails, you can manually enter the VIN. Ensure a stable network connection for successful VIN access. - Q: Diagnostic software needs updating.
A: Connect the tool to a stable Wi-Fi network and use the 'Upgrade' function in the Job Menu to download and install the latest software. - Q: How to clear fault codes?
A: After performing necessary repairs, navigate to the 'Clear Fault Code' function within the diagnostic menu. Ensure the vehicle's ignition is ON and the engine is OFF before proceeding. Clearing codes without repair will not resolve the underlying issue. - Q: What if the tool displays an error message during operation?
A: Note down the error message and refer to the 'Feedback' module in the Toolbox to report the issue to technical support. You can also consult the 'Product Manual' or 'FAQ' sections within the tool. - Q: Can I add more diagnostic functions?
A: Yes, additional reset functions and full system diagnostics for specific car brands can be purchased and subscribed to via the 'Mall' function on the device.
11. Warranty and Support
11.1 Warranty
This LAUNCH electronic product is warranted against defects in materials and workmanship for one year (12 months) from the date of delivery to the user. This warranty does not cover any part that has been abused, altered, used for a purpose other than for which it was intended, or used in a manner inconsistent with instructions regarding use. The exclusive remedy for any defective automotive meter is repair or replacement. LAUNCH shall not be liable for any consequential or incidental damages.
Final determination of defects shall be made by LAUNCH in accordance with established procedures. No agent, employee, or representative of LAUNCH has any authority to bind LAUNCH to any affirmation, representation, or warranty concerning LAUNCH automotive meters, except as stated herein.
11.2 Customer Service
If you have any questions on the operation of the unit, contact the seller, or contact LAUNCH TECH Service Center:
- Website: https://en.cnlaunch.com
- Phone: +86 755 8455 7891
- Email: overseas.service@cnlaunch.com
12. Compliance Information
12.1 FCC and IC Compliance
FCC ID: XUJCRP123XV3
IC: 29886-CRP129IV3
Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
This device complies with Innovation, Science and Economic Development Canada's licence-exempt RSSs and part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference; and
- This device must accept any interference received, including interference that may cause undesired operation.
This Class B digital apparatus complies with Canadian ICES-003.
12.2 Specific Absorption Rate (SAR) Information
This product meets government requirements for exposure to radio waves. The SAR limit is 1.6 W/kg averaged over one gram of tissue. This device has been tested against this SAR limit for typical body-worn operations 0mm from the body. To maintain compliance with RF exposure requirements, use accessories that maintain a 0mm separation distance between the user's body.
Body-worn accessories that do not meet these requirements may not comply with RF exposure requirements and should be avoided. Use only the supplied or an approved antenna.
12.3 EU Compliance
This device is in compliance with the essential requirements and other relevant provisions of Radio Equipment Directive 2014/53/EU. The RF frequencies can be used in Europe without restriction.





