What Is an OBD2 Scanner and Tuner, and How Does It Work?

The Obd2 Scanner And Tuner is a powerful tool for vehicle diagnostics and performance enhancement, allowing users to read and clear diagnostic trouble codes (DTCs), monitor live data, and even flash custom tunes. At CAR-TOOL.EDU.VN, we provide in-depth information and comparisons of various OBD2 tools to help you make the best choice for your needs. Think of it as your key to unlocking your car’s hidden potential.

1. What Is an OBD2 Scanner and Tuner?

An OBD2 scanner and tuner is a device that connects to a vehicle’s On-Board Diagnostics II (OBD2) port, providing access to the vehicle’s computer system. According to the Environmental Protection Agency (EPA), all cars and light trucks manufactured for sale in the United States after January 1, 1996, are required to be OBD2 compliant.

• Functionality: These tools are designed to read and clear diagnostic trouble codes (DTCs), monitor real-time vehicle data (such as engine temperature, speed, and RPM), and, in the case of tuners, modify the vehicle’s performance parameters.

• Two Primary Functions:

  • Scanning: An OBD2 scanner reads data from the vehicle’s computer, diagnosing problems by interpreting trouble codes.
  • Tuning: An OBD2 tuner allows users to modify the vehicle’s software to optimize performance, fuel efficiency, or other parameters.

• Benefits: Using an OBD2 scanner and tuner can save money on mechanic visits, improve vehicle performance, and provide valuable insights into your vehicle’s health.

2. What Are the Main Types of OBD2 Scanners and Tuners?

OBD2 scanners and tuners come in various forms, each with its own set of features and capabilities. Choosing the right one depends on your specific needs and technical expertise.

• Basic OBD2 Scanners: These are entry-level devices designed for reading and clearing DTCs. They typically offer basic information about the fault and are suitable for simple diagnostics.
• Advanced OBD2 Scanners: These scanners provide more detailed information, such as live data streams, freeze frame data, and advanced diagnostic tests. They are often used by professional mechanics for comprehensive vehicle analysis.
• OBD2 Tuners/Programmers: These devices allow users to modify the vehicle’s engine control unit (ECU) parameters, such as fuel injection, ignition timing, and rev limits. They are used to improve performance, fuel economy, or customize the driving experience.
• Wireless OBD2 Adapters: These adapters connect to the OBD2 port and transmit data wirelessly to a smartphone or tablet via Bluetooth or Wi-Fi. They require a compatible app to display the data and perform diagnostic functions.
• Handheld OBD2 Scanners: These are standalone devices with a built-in screen for displaying data. They are portable and easy to use, making them a popular choice for DIY enthusiasts.

3. How Does an OBD2 Scanner and Tuner Work?

The operation of an OBD2 scanner and tuner involves several key steps, from connecting to the vehicle’s computer to interpreting the data and making necessary adjustments.

• Connection: The OBD2 scanner or tuner connects to the vehicle’s OBD2 port, which is typically located under the dashboard on the driver’s side.

• Communication: Once connected, the device communicates with the vehicle’s ECU using standardized OBD2 protocols. According to the Society of Automotive Engineers (SAE), these protocols include:

  • SAE J1850 PWM
  • SAE J1850 VPW
  • ISO 9141-2
  • ISO 14230-4 (KWP2000)
  • ISO 15765-4 (CAN)

• Data Retrieval: The scanner retrieves data from the ECU, including diagnostic trouble codes (DTCs), live sensor data, and vehicle information.

• Interpretation: The scanner translates the data into a readable format, displaying DTCs with descriptions of the fault. Live data is presented in real-time, allowing users to monitor various parameters.

• Tuning (for Tuners): Tuners allow users to modify ECU parameters by uploading custom tunes. These tunes can adjust fuel maps, ignition timing, and other settings to optimize performance.

• Clearing Codes: After addressing the issue, the scanner can clear the DTCs, turning off the “Check Engine” light.

4. What Are the Benefits of Using an OBD2 Scanner and Tuner?

Using an OBD2 scanner and tuner offers numerous advantages, from saving money on repairs to improving vehicle performance and understanding your vehicle’s overall health.

• Cost Savings: By diagnosing and addressing issues early, you can prevent costly repairs down the road. Identifying problems yourself reduces the need for expensive diagnostic services at a mechanic.
• Improved Performance: Tuners allow you to optimize your vehicle’s performance by adjusting engine parameters. This can result in increased horsepower, torque, and improved throttle response.
• Better Fuel Economy: Tuning can also improve fuel efficiency by optimizing the air-fuel mixture and ignition timing. This can save you money at the gas pump and reduce your carbon footprint.
• Vehicle Health Monitoring: Regular use of an OBD2 scanner allows you to monitor your vehicle’s health, identifying potential issues before they become major problems.
• Customization: Tuners offer the ability to customize your vehicle’s performance to suit your driving style and preferences.
• DIY Convenience: With an OBD2 scanner and tuner, you can perform many diagnostic and tuning tasks yourself, saving time and money.

5. How to Choose the Right OBD2 Scanner and Tuner for Your Needs?

Selecting the appropriate OBD2 scanner and tuner requires careful consideration of your vehicle type, technical skills, and specific requirements.

• Vehicle Compatibility: Ensure the scanner or tuner is compatible with your vehicle’s make, model, and year. Some devices are designed for specific vehicle brands or models.
• Features: Consider the features you need, such as live data streaming, advanced diagnostic tests, and tuning capabilities. Basic scanners may suffice for simple tasks, while advanced users may require more comprehensive features.
• Ease of Use: Choose a device that is easy to use and navigate, with a clear display and intuitive interface. Consider wireless adapters with smartphone apps for added convenience.
• Budget: OBD2 scanners and tuners range in price from basic models to professional-grade devices. Determine your budget and choose a device that offers the best value for your money.
• Software and Updates: Check if the device comes with software and if updates are available. Regular updates ensure compatibility with new vehicles and features.
• Reviews and Ratings: Read reviews and ratings from other users to get an idea of the device’s performance and reliability. Look for reputable brands and models with positive feedback.

6. What Are the Key Features to Look for in an OBD2 Scanner and Tuner?

When evaluating OBD2 scanners and tuners, certain features can significantly enhance their functionality and usability.

• Live Data Streaming: Allows you to monitor real-time data from various sensors, providing valuable insights into your vehicle’s performance.
• DTC Reading and Clearing: Essential for diagnosing and resolving issues, allowing you to read and clear diagnostic trouble codes.
• Freeze Frame Data: Captures data from the moment a DTC is triggered, providing a snapshot of the conditions that led to the fault.
• O2 Sensor Testing: Allows you to test the oxygen sensors to ensure they are functioning properly, which is crucial for fuel efficiency and emissions control.
• Evap System Testing: Tests the evaporative emissions control system to detect leaks and ensure compliance with environmental regulations.
• ABS and SRS Diagnostics: Some advanced scanners offer diagnostics for anti-lock braking systems (ABS) and supplemental restraint systems (SRS), providing comprehensive vehicle coverage.
• Bi-Directional Control: Allows you to send commands to the vehicle’s ECU to test components and systems, such as turning on the cooling fan or cycling the fuel pump.
• Data Logging: Records data over time, allowing you to analyze performance and identify intermittent issues.
• Custom Tuning: For tuners, look for features such as adjustable parameters, pre-loaded tunes, and the ability to create custom tunes.
• Wireless Connectivity: Bluetooth or Wi-Fi connectivity allows you to connect to smartphones, tablets, and computers for added convenience.

7. What Are the Top OBD2 Scanner and Tuner Brands on the Market?

Several brands are known for producing high-quality OBD2 scanners and tuners. Here are some of the top brands in the market:

• Autel: Autel is a leading manufacturer of automotive diagnostic tools, offering a wide range of scanners and tuners for both professional and DIY users.
• Actron: Actron is a popular brand known for its affordable and reliable OBD2 scanners, suitable for basic diagnostics and code reading.
• Innova: Innova offers a variety of OBD2 scanners with features such as ABS/SRS diagnostics, live data streaming, and Bluetooth connectivity.
• DiabloSport: DiabloSport specializes in performance tuners for cars, trucks, and SUVs, offering pre-loaded tunes and custom tuning options.
• SCT Performance: SCT Performance is a well-known brand for tuning devices, providing customizable tuning solutions for Ford, GM, and Chrysler vehicles.
• Edge Products: Edge Products offers a range of tuning devices and monitors, allowing users to adjust engine parameters and monitor performance in real-time.

8. What Are Some Common OBD2 Codes and Their Meanings?

Understanding common OBD2 codes can help you diagnose and address issues more effectively. Here are some common codes and their meanings:

Code	Description	Possible Causes
P0101	Mass Air Flow (MAF) Sensor Range/Performance	Dirty or faulty MAF sensor, vacuum leaks, air intake restrictions
P0113	Intake Air Temperature (IAT) Sensor Circuit High Input	Faulty IAT sensor, wiring issues, loose connections
P0171	System Too Lean (Bank 1)	Vacuum leaks, faulty oxygen sensor, low fuel pressure, dirty fuel injectors
P0300	Random/Multiple Cylinder Misfire Detected	Faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression
P0420	Catalyst System Efficiency Below Threshold (Bank 1)	Faulty catalytic converter, faulty oxygen sensors, exhaust leaks
P0442	Evaporative Emission Control System Leak Detected (Small Leak)	Loose or faulty gas cap, damaged fuel tank, faulty purge valve, leaks in EVAP system hoses
P0505	Idle Air Control System Malfunction	Dirty or faulty idle air control valve, vacuum leaks, throttle body issues
P0700	Transmission Control System Malfunction	Faulty transmission sensors, solenoid issues, low transmission fluid, internal transmission damage
P0131	O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
P0134	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)	Faulty O2 sensor, wiring issues, exhaust leaks
B0092	Driver Air Bag Loop Open Circuit	Faulty Clock Spring, Wiring Issues, Connector Issues

9. How to Use an OBD2 Scanner and Tuner Safely and Effectively?

Using an OBD2 scanner and tuner safely and effectively requires following certain guidelines and precautions.

• Read the Manual: Familiarize yourself with the device’s manual before using it. Understand the features, functions, and limitations of the scanner or tuner.
• Connect Properly: Ensure the scanner or tuner is properly connected to the OBD2 port. A loose or improper connection can result in inaccurate data or damage to the vehicle’s computer system.
• Follow Instructions: Follow the on-screen instructions and prompts carefully. Avoid making changes or adjustments unless you fully understand their implications.
• Back Up Data: Before making any modifications to the vehicle’s ECU, back up the original data. This allows you to revert to the original settings if needed.
• Monitor Parameters: When tuning, monitor critical parameters such as engine temperature, air-fuel ratio, and ignition timing. Avoid pushing the engine beyond its safe operating limits.
• Seek Professional Help: If you are unsure about any aspect of using an OBD2 scanner and tuner, seek professional help from a qualified mechanic or tuner.
• Use in a Safe Environment: Always use the scanner or tuner in a safe and well-ventilated environment. Avoid using it while driving or in hazardous conditions.
• Keep Software Updated: Keep the scanner or tuner’s software updated to ensure compatibility with new vehicles and features. Regular updates also address potential security vulnerabilities.
• Disconnect After Use: After using the scanner or tuner, disconnect it from the OBD2 port. Leaving it connected can drain the vehicle’s battery.

10. What Are Some Tips for Maintaining Your OBD2 Scanner and Tuner?

Proper maintenance of your OBD2 scanner and tuner ensures its longevity and reliable performance.

• Store Properly: Store the scanner or tuner in a clean, dry place when not in use. Avoid exposing it to extreme temperatures, humidity, or direct sunlight.
• Clean Regularly: Clean the device’s screen and connectors regularly with a soft, dry cloth. Avoid using harsh chemicals or solvents that can damage the device.
• Protect from Damage: Protect the scanner or tuner from physical damage, such as drops, impacts, and excessive vibration.
• Keep Software Updated: Keep the device’s software updated to ensure compatibility with new vehicles and features. Regular updates also address potential security vulnerabilities.
• Check Cables and Connectors: Inspect the cables and connectors regularly for damage or wear. Replace any damaged cables or connectors to ensure proper connectivity.
• Replace Batteries: If the scanner or tuner uses batteries, replace them regularly to ensure optimal performance. Use the correct type of batteries and follow the manufacturer’s instructions.
• Calibrate Sensors: Some advanced scanners may require periodic calibration of sensors. Follow the manufacturer’s instructions for calibrating sensors to ensure accurate readings.
• Avoid Overloading: Avoid overloading the scanner or tuner with excessive data or commands. This can cause the device to malfunction or crash.

11. What is the Future of OBD2 Scanners and Tuners?

The future of OBD2 scanners and tuners is poised for significant advancements, driven by technological innovations and evolving vehicle systems. Expect to see:

• Enhanced Connectivity: Increased integration with smartphones, tablets, and cloud-based platforms, offering seamless data sharing and remote diagnostics.
• Advanced Diagnostics: Incorporation of artificial intelligence (AI) and machine learning to provide more accurate and insightful diagnostic information, including predictive maintenance alerts.
• Expanded Vehicle Coverage: Support for new vehicle technologies, such as electric vehicles (EVs) and autonomous vehicles, with specialized diagnostic and tuning capabilities.
• Improved User Interface: More intuitive and user-friendly interfaces, with enhanced graphics, touch screen displays, and voice control features.
• Wireless Updates: Over-the-air (OTA) software updates, ensuring scanners and tuners are always up-to-date with the latest vehicle protocols and features.
• Cybersecurity Features: Enhanced security measures to protect against unauthorized access and tampering, ensuring the integrity of vehicle systems.
• Integration with ADAS: Diagnostic capabilities for advanced driver-assistance systems (ADAS), such as lane departure warning, adaptive cruise control, and automatic emergency braking.
• Remote Diagnostics: Remote diagnostic capabilities, allowing technicians to diagnose and troubleshoot vehicle issues from a remote location, improving efficiency and reducing downtime.

12. Understanding OBD2 Protocols

OBD2 (On-Board Diagnostics II) protocols are standardized communication interfaces used in vehicles to provide diagnostic data and control certain functions. These protocols ensure that diagnostic tools can communicate with a wide range of vehicles, regardless of the manufacturer. Here’s a breakdown of the key OBD2 protocols:

1. SAE J1850 PWM (Pulse Width Modulation)

• Usage: Primarily used by Ford vehicles.
• Characteristics: Operates at a variable pulse width, which determines the data being transmitted.
• Voltage: Uses a voltage of 5 volts.
• Key Features: Single-wire communication, variable pulse width for data encoding.

2. SAE J1850 VPW (Variable Pulse Width)

• Usage: Mainly used by General Motors (GM) vehicles.
• Characteristics: Similar to PWM but uses a variable pulse width on a different voltage level.
• Voltage: Operates at 7.5 volts.
• Key Features: Single-wire communication, variable pulse width for data encoding.

3. ISO 9141-2

• Usage: Common in Chrysler, European, and Asian vehicles.
• Characteristics: Uses an asynchronous serial communication protocol.
• Key Features: K-line for communication, optional L-line for initialization.

4. ISO 14230-4 (KWP2000)

• Usage: Used in a variety of vehicles, including those from BMW, Mercedes-Benz, and Volkswagen.
• Characteristics: Key Word Protocol 2000, built upon ISO 9141-2.
• Key Features: K-line communication, standardized data format.

5. ISO 15765-4 (CAN – Controller Area Network)

• Usage: Required for all vehicles sold in the US after 2008 and widely adopted globally.
• Characteristics: A robust, high-speed communication protocol.
• Key Features: Two-wire communication (CAN High and CAN Low), standardized data format.

CAN Bus Variants

• High-Speed CAN (ISO 15765-4): Used for critical systems like engine and transmission.
• Single-Wire CAN (SAE J2411): Slower and more fault-tolerant, used for less critical systems.
• Low-Speed CAN (SAE J2411): Also known as GMLAN (GM Local Area Network), used for body control systems.
• MS-CAN (Medium Speed CAN): Used by Ford, Mazda, and other manufacturers for body and comfort systems.

Benefits of Standardized Protocols

• Compatibility: Allows diagnostic tools to work with a wide range of vehicles.
• Uniformity: Provides a standard way to access vehicle data.
• Efficiency: Streamlines the diagnostic process.
• Cost Savings: Reduces the need for manufacturer-specific tools.

13. OBD2 Tuning: What Can You Adjust?

OBD2 tuning involves modifying the software in a vehicle’s Engine Control Unit (ECU) to optimize performance, fuel efficiency, or other parameters. Here are some common adjustments you can make with OBD2 tuning:

1. Fuel Maps

• Adjustment: Modifying the air-fuel ratio (AFR) to optimize combustion.
• Benefits: Improved horsepower, torque, and fuel efficiency.
• Considerations: Requires careful calibration to avoid engine damage.

2. Ignition Timing

• Adjustment: Changing the timing of the spark to optimize combustion.
• Benefits: Increased power and throttle response.
• Considerations: Advancing timing too much can cause detonation.

3. Rev Limiter

• Adjustment: Modifying the maximum engine speed.
• Benefits: Allows the engine to rev higher for increased performance.
• Considerations: Can reduce engine lifespan if set too high.

4. Speed Limiter

• Adjustment: Modifying the vehicle’s top speed.
• Benefits: Increased top speed for performance applications.
• Considerations: May not be legal in all areas.

5. Throttle Response

• Adjustment: Modifying the sensitivity of the throttle pedal.
• Benefits: Improved throttle response and acceleration.
• Considerations: May make the vehicle more difficult to control in some situations.

6. Transmission Parameters

• Adjustment: Modifying shift points and firmness.
• Benefits: Improved shift performance and reduced shift times.
• Considerations: Requires careful calibration to avoid transmission damage.

7. Boost Control (for Turbocharged Vehicles)

• Adjustment: Modifying the amount of boost produced by the turbocharger.
• Benefits: Increased horsepower and torque.
• Considerations: Requires careful monitoring to avoid overboost and engine damage.

8. Idle Speed

• Adjustment: Modifying the engine’s idle speed.
• Benefits: Smoother idle and reduced stalling.
• Considerations: Requires careful calibration to avoid rough idling.

14. OBD2 Scanner and Tuner: Legal Considerations

Using OBD2 scanners and tuners is generally legal, but there are some important legal considerations to keep in mind:

1. Emissions Regulations

• Compliance: Modifying a vehicle’s ECU can affect its emissions, potentially violating local, state, or federal regulations.
• Testing: Vehicles may be required to pass emissions tests, and modifications that cause a vehicle to fail these tests are illegal.
• EPA Regulations: The Environmental Protection Agency (EPA) has strict regulations on modifying vehicles in ways that increase emissions.

2. Tampering Laws

• Prohibition: Tampering with a vehicle’s emissions control system is illegal under the Clean Air Act.
• Penalties: Violations can result in significant fines and penalties.

3. Warranty Issues

• Voiding Warranty: Modifying a vehicle’s ECU can void the manufacturer’s warranty.
• Burden of Proof: If a warranty claim is denied due to modifications, the vehicle owner may have the burden of proving that the modifications did not cause the issue.

4. Safety Standards

• Compliance: Modifications that compromise a vehicle’s safety features may be illegal.
• Liability: Vehicle owners may be liable for damages or injuries caused by modifications that compromise safety.

5. Local Laws

• Variations: Local laws and regulations regarding vehicle modifications can vary significantly.
• Research: It is important to research and comply with local laws before making any modifications to a vehicle.

15. Common Misconceptions About OBD2 Scanners and Tuners

There are several misconceptions about OBD2 scanners and tuners that can lead to confusion and incorrect usage. Let’s clarify some of these common misconceptions:

• Misconception 1: All OBD2 Scanners and Tuners are the Same

  • Reality: OBD2 scanners and tuners vary widely in terms of features, capabilities, and price. Basic scanners can only read and clear codes, while advanced tuners offer extensive customization options.

• Misconception 2: Using an OBD2 Tuner Will Always Increase Performance

  • Reality: While tuners can improve performance, they require careful calibration. Incorrect settings can lead to engine damage and reduced performance.

• Misconception 3: OBD2 Scanners Can Fix Any Problem

  • Reality: OBD2 scanners can diagnose problems by reading codes, but they cannot fix the underlying issues. The scanner only identifies the problem; actual repairs must be performed separately.

• Misconception 4: You Need to be a Mechanic to Use an OBD2 Scanner

  • Reality: While some advanced scanners are designed for professionals, many user-friendly models are available for DIY enthusiasts. With some basic knowledge, anyone can use an OBD2 scanner for simple diagnostics.

• Misconception 5: Clearing Codes Will Fix the Problem

  • Reality: Clearing codes only turns off the “Check Engine” light; it does not fix the underlying problem. The code will likely reappear if the issue is not addressed.

• Misconception 6: OBD2 Tuners are Illegal

  • Reality: OBD2 tuners are legal, but using them to modify a vehicle in a way that violates emissions regulations is illegal. It’s important to comply with local, state, and federal laws.

• Misconception 7: All OBD2 Ports are the Same

  • Reality: While OBD2 ports are standardized, some vehicles may have proprietary systems that require specific scanners or adapters.

• Misconception 8: OBD2 Scanners Can Diagnose Transmission Problems

  • Reality: While OBD2 scanners can read some transmission-related codes, they may not provide comprehensive diagnostics for complex transmission issues. Advanced scanners with transmission-specific diagnostics are needed for thorough analysis.

• Misconception 9: Using an OBD2 Scanner Will Void Your Warranty

  • Reality: Simply using an OBD2 scanner will not void your warranty. However, modifying the ECU with a tuner can void the warranty if the modifications cause damage to the vehicle.

• Misconception 10: OBD2 Scanners Can Provide Real-Time Horsepower and Torque Readings

  • Reality: While some advanced scanners can estimate horsepower and torque based on sensor data, they cannot provide real-time, dyno-accurate readings.

FAQ Section: OBD2 Scanners and Tuners

Q1: What is the difference between an OBD2 scanner and an OBD2 tuner?

An OBD2 scanner reads diagnostic trouble codes (DTCs) and live data from your vehicle’s computer, while an OBD2 tuner allows you to modify the vehicle’s engine control unit (ECU) parameters to optimize performance or fuel economy.

Q2: Are OBD2 scanners and tuners compatible with all vehicles?

OBD2 scanners and tuners are generally compatible with all cars and light trucks manufactured for sale in the United States after January 1, 1996, as required by the EPA. However, compatibility may vary depending on the make, model, and year of the vehicle.

Q3: Can I use an OBD2 scanner to diagnose ABS and SRS issues?

Some advanced OBD2 scanners offer diagnostics for anti-lock braking systems (ABS) and supplemental restraint systems (SRS). Check the scanner’s specifications to ensure it supports these features.

Q4: Will using an OBD2 tuner void my vehicle’s warranty?

Modifying a vehicle’s ECU with an OBD2 tuner can void the manufacturer’s warranty if the modifications cause damage to the vehicle. It’s important to understand the terms of your warranty before making any modifications.

Q5: How do I update the software on my OBD2 scanner or tuner?

Software updates are typically available from the manufacturer’s website. Follow the instructions provided by the manufacturer to download and install the updates.

Q6: Can I use an OBD2 scanner with my smartphone or tablet?

Yes, wireless OBD2 adapters are available that connect to the OBD2 port and transmit data wirelessly to a smartphone or tablet via Bluetooth or Wi-Fi. You will need a compatible app to display the data and perform diagnostic functions.

Q7: How do I interpret OBD2 codes?

OBD2 codes are typically five characters long, consisting of a letter followed by four numbers. The letter indicates the system affected (e.g., P for powertrain, B for body, C for chassis), and the numbers provide more specific information about the fault.

Q8: Can I clear OBD2 codes myself?

Yes, you can clear OBD2 codes using an OBD2 scanner. However, it’s important to address the underlying issue that caused the code to appear, or it will likely reappear.

Q9: What is live data streaming, and why is it important?

Live data streaming allows you to monitor real-time data from various sensors in your vehicle. This can provide valuable insights into your vehicle’s performance and help you diagnose issues more effectively.

Q10: Are there any legal restrictions on using OBD2 tuners?

Yes, modifying a vehicle in a way that violates emissions regulations is illegal. It’s important to comply with local, state, and federal laws before making any modifications.

By understanding the capabilities and limitations of OBD2 scanners and tuners, you can make informed decisions and use these tools effectively to diagnose and maintain your vehicle.

CAR-TOOL.EDU.VN is your go-to resource for detailed information on OBD2 scanners and tuners, helping you choose the best tools for your needs and providing expert guidance on their proper use. Remember, the right tool can save you time and money while keeping your vehicle running smoothly.

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