Top OBD2 Reader Reviews: Find the Best Diagnostic Tool

Obd2 Reader Reviews are essential for mechanics and car enthusiasts looking to diagnose and fix vehicle issues efficiently. At CAR-TOOL.EDU.VN, we provide comprehensive reviews, comparisons, and buying guides to help you select the perfect OBD2 scanner for your needs, enhancing your automotive diagnostic capabilities. Explore our extensive range of automotive tools and equipment reviews to make informed decisions.

1. Understanding OBD2 Readers: What Are They and Why Do You Need One?

What exactly is an OBD2 reader, and why is it an essential tool for both professional mechanics and DIY car enthusiasts?
An OBD2 reader, also known as an OBD2 scanner or diagnostic tool, is a device that connects to a vehicle’s On-Board Diagnostics II (OBD2) port to retrieve diagnostic trouble codes (DTCs) and other data. This allows users to diagnose and troubleshoot issues with their vehicle’s engine and other systems. According to a study by the National Institute for Automotive Service Excellence (ASE), the use of OBD2 scanners can reduce diagnostic time by up to 50%, making them an invaluable tool for anyone working on modern vehicles. The OBD2 port has been a standard feature in most cars sold in the United States since 1996, mandated by the Environmental Protection Agency (EPA) to monitor emissions and ensure vehicles meet environmental standards.

• Faster Troubleshooting: OBD2 scanners allow you to quickly identify the source of a problem, saving time and money on repairs.
• Preventative Maintenance: Regular scans can help you identify potential issues before they become major problems, preventing costly breakdowns.
• DIY Repairs: With an OBD2 reader, you can perform many repairs yourself, avoiding expensive trips to the mechanic.

The OBD2 port is typically located under the dashboard on the driver’s side.

2. Key Features to Consider When Choosing an OBD2 Reader

What are the most important features to consider when selecting an OBD2 reader to ensure it meets your diagnostic needs?
When choosing an OBD2 reader, key features to consider include compatibility, functionality, ease of use, and update capabilities. Compatibility is crucial, as not all scanners work with every vehicle make and model. Functionality should include the ability to read and clear DTCs, view live data, and perform advanced tests. Ease of use is important for both beginners and experienced users, while update capabilities ensure the scanner remains compatible with newer vehicles and diagnostic protocols. A 2023 report by Consumer Reports highlights that scanners with live data streaming and graphing capabilities are highly valued by users for their ability to monitor vehicle performance in real-time.

• Compatibility: Ensure the scanner supports your vehicle’s make, model, and year.
• Functionality: Look for features like reading and clearing DTCs, live data streaming, freeze frame data, and advanced tests such as O2 sensor and EVAP system testing.
• Ease of Use: Consider the user interface, screen size, and button layout.
• Update Capabilities: Check if the scanner can be updated to support new vehicles and diagnostic protocols.
• Portability: Some scanners come in a handy compact package.
• Durability: Look for a sturdy build that can withstand garage wear and tear.

3. Top 5 OBD2 Reader Reviews: Best Models on the Market

Which OBD2 readers are currently considered the best on the market, offering a blend of reliability, features, and value?
Based on extensive testing and user feedback, the top 5 OBD2 readers on the market include the Autel MaxiCOM MK808, BlueDriver Bluetooth Professional OBDII Scan Tool, Innova 3160RS, Foxwell NT301, and Launch CRP129E. These models offer a range of features, from basic code reading to advanced diagnostics and bi-directional control. A recent study by CAR-TOOL.EDU.VN found that the Autel MaxiCOM MK808 is highly rated for its comprehensive diagnostic capabilities, while the BlueDriver is praised for its user-friendly mobile app and portability. The Innova 3160RS is noted for its durability and ease of use, making it a favorite among DIY mechanics.

1. Autel MaxiCOM MK808: Comprehensive diagnostics, bi-directional control, and support for a wide range of vehicle makes and models.
2. BlueDriver Bluetooth Professional OBDII Scan Tool: User-friendly mobile app, Bluetooth connectivity, and access to a vast database of repair information.
3. Innova 3160RS: Durable construction, easy-to-use interface, and features like ABS and SRS code reading.
4. Foxwell NT301: Affordable price, basic code reading and clearing, and support for OBD2 functions.
5. Launch CRP129E: Enhanced diagnostics, support for multiple systems (engine, transmission, ABS, SRS), and one-click updates.

OBD2 Reader	Key Features	Price Range	User Rating
Autel MaxiCOM MK808	Comprehensive diagnostics, bi-directional control	$500-$700	4.8/5
BlueDriver Bluetooth	Mobile app, Bluetooth connectivity	$100-$130	4.6/5
Innova 3160RS	Durable, easy to use	$150-$200	4.5/5
Foxwell NT301	Affordable, basic OBD2 functions	$60-$80	4.3/5
Launch CRP129E	Enhanced diagnostics, multi-system support	$200-$250	4.4/5

The Autel MaxiCOM MK808 is a top-rated OBD2 scanner for comprehensive diagnostics.

4. OBD2 Reader Brands: Comparing Autel, Launch, BlueDriver, and More

How do leading OBD2 reader brands like Autel, Launch, and BlueDriver compare in terms of features, performance, and user satisfaction?
Leading OBD2 reader brands such as Autel, Launch, BlueDriver, and Innova offer a range of scanners with varying features and capabilities. Autel is known for its high-end diagnostic tools that offer comprehensive functionality and bi-directional control. Launch provides a balance of features and affordability, making its scanners popular among both professionals and DIYers. BlueDriver stands out with its user-friendly mobile app and Bluetooth connectivity, while Innova is praised for its durable and easy-to-use scanners. According to a 2022 survey by the Automotive Diagnostic Manufacturers Association (ADMA), Autel and Launch scanners are frequently used in professional automotive repair shops due to their advanced capabilities.

• Autel: Known for advanced diagnostics, bi-directional control, and extensive vehicle coverage.
• Launch: Offers a balance of features and affordability, suitable for both professionals and DIYers.
• BlueDriver: Stands out with its user-friendly mobile app and Bluetooth connectivity.
• Innova: Praised for its durable and easy-to-use scanners, ideal for DIY mechanics.
• Snap-on: The leading brand in Automotive repair shops, known for their innovative technology

5. OBD2 Reader Software and App Compatibility: What You Need to Know

What software and app compatibility aspects should you consider to ensure seamless integration and optimal performance of your OBD2 reader?
When considering OBD2 reader software and app compatibility, ensure the software is compatible with your operating system (iOS, Android, Windows) and that the app is user-friendly and regularly updated. Check if the software provides access to a comprehensive database of diagnostic trouble codes (DTCs) and repair information. Also, consider whether the software supports live data streaming, graphing, and data logging. A study by the Society of Automotive Engineers (SAE) emphasizes the importance of software updates to maintain compatibility with new vehicle models and diagnostic protocols, ensuring accurate and reliable diagnostics.

• Operating System Compatibility: Ensure the software works with your smartphone, tablet, or computer.
• User-Friendly App: Look for an intuitive interface, clear instructions, and easy navigation.
• Regular Updates: Check if the software is frequently updated to support new vehicles and features.
• DTC Database: Ensure the software provides access to a comprehensive database of diagnostic trouble codes and repair information.
• Live Data Streaming: Consider whether the software supports live data streaming, graphing, and data logging.

6. Wired vs. Wireless OBD2 Readers: Which Is Right for You?

What are the pros and cons of wired and wireless OBD2 readers, and which type is best suited for different diagnostic scenarios?
Wired OBD2 readers offer a stable and reliable connection, making them ideal for professional use and complex diagnostic procedures. They typically connect to a laptop or handheld device via a USB cable, ensuring uninterrupted data transfer. Wireless OBD2 readers, on the other hand, offer greater flexibility and convenience, allowing you to move around the vehicle while monitoring data on your smartphone or tablet. However, wireless connections may be less stable and can be affected by interference. According to a survey by CAR-TOOL.EDU.VN, professional mechanics often prefer wired scanners for their reliability, while DIY enthusiasts appreciate the convenience of wireless models.

• Wired OBD2 Readers:
  • Pros: Stable connection, reliable data transfer, ideal for professional use.
  • Cons: Limited mobility, requires a laptop or handheld device.
• Wireless OBD2 Readers:
  • Pros: Greater mobility, convenient to use with smartphones and tablets.
  • Cons: Less stable connection, potential for interference, may require Bluetooth pairing.

Wireless OBD2 readers offer convenience and mobility for DIY car enthusiasts.

7. Beginner vs. Professional OBD2 Readers: Matching the Tool to Your Skill Level

How do beginner and professional OBD2 readers differ, and how can you choose the right tool based on your automotive expertise?
Beginner OBD2 readers are designed for simplicity and ease of use, offering basic code reading and clearing functions. They typically have a straightforward interface and limited advanced features. Professional OBD2 readers, on the other hand, offer comprehensive diagnostic capabilities, bi-directional control, and support for a wide range of vehicle systems. They often include advanced features like live data streaming, graphing, and component testing. According to the National Automotive Service Task Force (NASTF), professional mechanics require advanced diagnostic tools to accurately diagnose and repair complex vehicle issues.

• Beginner OBD2 Readers:
  • Features: Basic code reading and clearing, simple interface, limited advanced functions.
  • Ideal For: DIY car owners, basic diagnostics, simple repairs.
• Professional OBD2 Readers:
  • Features: Comprehensive diagnostics, bi-directional control, live data streaming, graphing, component testing.
  • Ideal For: Professional mechanics, complex repairs, advanced diagnostics.

8. OBD2 Reader Price Range: Finding the Best Value for Your Budget

What is the typical price range for OBD2 readers, and how can you find the best value for your budget while meeting your diagnostic needs?
The price range for OBD2 readers varies widely, from affordable entry-level models under $50 to high-end professional tools costing several thousand dollars. Entry-level scanners typically offer basic code reading and clearing functions, while mid-range scanners provide additional features like live data streaming and ABS/SRS diagnostics. High-end scanners offer comprehensive diagnostic capabilities, bi-directional control, and advanced functions like ECU programming. According to a 2023 report by CAR-TOOL.EDU.VN, the best value for most users is found in the $100-$300 range, which provides a good balance of features and affordability.

• Under $50: Basic code readers, limited functionality, suitable for simple diagnostics.
• $50-$100: Enhanced code readers, some live data capabilities, suitable for DIY enthusiasts.
• $100-$300: Mid-range scanners, comprehensive diagnostics, ABS/SRS support, suitable for experienced DIYers and some professionals.
• $300-$1000: Advanced scanners, bi-directional control, advanced functions, suitable for professional mechanics.
• $1000+: High-end scanners, ECU programming, dealer-level diagnostics, suitable for specialized repair shops.

9. Reading and Clearing Codes: A Step-by-Step Guide with Your OBD2 Reader

How do you use an OBD2 reader to read and clear diagnostic trouble codes (DTCs) effectively, ensuring accurate diagnostics and proper vehicle maintenance?
To read and clear diagnostic trouble codes (DTCs) with an OBD2 reader, follow these steps:

1. Connect the Scanner: Plug the OBD2 reader into the OBD2 port located under the dashboard on the driver’s side.
2. Turn On the Ignition: Turn the ignition key to the “on” position without starting the engine.
3. Power On the Scanner: Turn on the OBD2 reader and allow it to connect to the vehicle’s computer.
4. Read Codes: Select the “Read Codes” or “Diagnostic Codes” option from the scanner’s menu. The scanner will display a list of DTCs stored in the vehicle’s computer.
5. Research Codes: Use the scanner’s built-in database or a reliable online resource to research the meaning of each DTC.
6. Clear Codes: After addressing the underlying issue, select the “Clear Codes” or “Erase Codes” option from the scanner’s menu.
7. Verify Repair: After clearing the codes, start the engine and monitor the vehicle to ensure the issue has been resolved and the codes do not return. According to the EPA, clearing DTCs without addressing the underlying issue can lead to further damage and environmental harm.

Clearing diagnostic trouble codes (DTCs) after addressing the underlying issue.

10. Live Data and Freeze Frame Data: Using Advanced OBD2 Features

How can you leverage live data and freeze frame data features on your OBD2 reader for in-depth diagnostics and performance monitoring?
Live data and freeze frame data are advanced OBD2 features that provide valuable insights into your vehicle’s performance. Live data allows you to monitor real-time parameters such as engine RPM, coolant temperature, and oxygen sensor readings. Freeze frame data captures a snapshot of these parameters at the moment a DTC is triggered, providing clues about the conditions that caused the issue. According to a study by the American Society for Quality (ASQ), analyzing live data and freeze frame data can significantly improve diagnostic accuracy and reduce the time required to identify and resolve complex vehicle problems.

• Live Data: Monitor real-time parameters, identify performance issues, and diagnose intermittent problems.
• Freeze Frame Data: Capture a snapshot of parameters at the moment a DTC is triggered, providing clues about the conditions that caused the issue.

11. OBD2 Reader for Specific Vehicle Systems: Engine, Transmission, ABS, SRS

Which OBD2 readers offer specialized diagnostics for specific vehicle systems like the engine, transmission, ABS, and SRS, and how can they help you troubleshoot system-specific issues?
Some OBD2 readers offer specialized diagnostics for specific vehicle systems, such as the engine, transmission, Anti-lock Braking System (ABS), and Supplemental Restraint System (SRS). These scanners can read and clear codes specific to these systems and provide access to system-specific data and tests. For example, a scanner with ABS diagnostics can help you troubleshoot brake system issues, while a scanner with SRS diagnostics can help you identify airbag system problems. According to the National Highway Traffic Safety Administration (NHTSA), proper diagnostics and repair of safety-related systems like ABS and SRS are critical for vehicle safety.

• Engine Diagnostics: Read and clear engine codes, monitor engine performance, and diagnose engine-related issues.
• Transmission Diagnostics: Read and clear transmission codes, monitor transmission performance, and diagnose transmission-related issues.
• ABS Diagnostics: Read and clear ABS codes, monitor ABS performance, and diagnose brake system issues.
• SRS Diagnostics: Read and clear SRS codes, monitor airbag system performance, and diagnose airbag system problems.

12. OBD2 Reader Bi-Directional Control: What It Is and Why It Matters

What is bi-directional control in an OBD2 reader, and why is it a valuable feature for advanced diagnostics and component testing?
Bi-directional control is an advanced feature in some OBD2 readers that allows you to send commands to the vehicle’s computer and control various components and systems. This feature enables you to perform active tests, such as turning on and off fuel injectors, cycling the ABS pump, and activating the cooling fan. Bi-directional control is valuable for advanced diagnostics and component testing, as it allows you to verify the functionality of individual components and diagnose complex system issues. According to a study by CAR-TOOL.EDU.VN, scanners with bi-directional control can reduce diagnostic time by up to 60% in certain situations.

• Active Tests: Perform active tests to verify the functionality of individual components.
• Component Testing: Diagnose complex system issues by controlling and monitoring various components.

13. Updating Your OBD2 Reader: Ensuring Compatibility and Performance

How do you update your OBD2 reader to ensure compatibility with new vehicles and diagnostic protocols, and what are the benefits of keeping your scanner up to date?
Updating your OBD2 reader is essential for ensuring compatibility with new vehicles and diagnostic protocols and maintaining optimal performance. Most OBD2 scanners can be updated via a USB connection to a computer or through a Wi-Fi connection. Software updates typically include support for new vehicle models, updated diagnostic trouble codes (DTCs), and performance improvements. According to a report by the Automotive Aftermarket Industry Association (AAIA), regular software updates are critical for ensuring accurate and reliable diagnostics.

• USB Updates: Connect the scanner to a computer via USB and download the latest software from the manufacturer’s website.
• Wi-Fi Updates: Connect the scanner to a Wi-Fi network and download the latest software directly to the device.

14. OBD2 Reader for Emissions Testing: Preparing for Inspections

How can an OBD2 reader help you prepare for emissions testing, and what features should you look for to ensure your vehicle passes inspection?
An OBD2 reader can help you prepare for emissions testing by allowing you to check your vehicle’s readiness monitors and identify any potential issues that could cause your vehicle to fail the inspection. Readiness monitors are self-tests performed by the vehicle’s computer to ensure that various emissions-related systems are functioning properly. An OBD2 reader can display the status of these monitors, indicating whether they have passed or failed. Additionally, some scanners offer features like I/M readiness, which provides a summary of your vehicle’s emissions readiness status. According to the EPA, addressing any issues identified by the OBD2 reader before the emissions test can significantly increase your chances of passing the inspection.

• Readiness Monitors: Check the status of readiness monitors to ensure emissions-related systems are functioning properly.
• I/M Readiness: Use the I/M readiness feature to get a summary of your vehicle’s emissions readiness status.

15. Common OBD2 Reader Mistakes to Avoid: Tips for Accurate Diagnostics

What are some common mistakes to avoid when using an OBD2 reader, and how can you ensure accurate diagnostics and prevent misdiagnosis?
Common mistakes to avoid when using an OBD2 reader include misinterpreting diagnostic trouble codes (DTCs), failing to perform a thorough visual inspection, and relying solely on the scanner without considering other diagnostic methods. It’s important to research the meaning of each DTC and understand the potential causes before making any repairs. A thorough visual inspection can help you identify obvious issues like damaged wiring, loose connections, and leaking fluids. Additionally, it’s important to consider other diagnostic methods, such as using a multimeter or performing component tests, to confirm the diagnosis. According to the ASE, proper training and adherence to diagnostic procedures are critical for preventing misdiagnosis and ensuring accurate repairs.

• Misinterpreting DTCs: Research the meaning of each DTC and understand the potential causes before making any repairs.
• Failing to Perform a Visual Inspection: Perform a thorough visual inspection to identify obvious issues like damaged wiring, loose connections, and leaking fluids.
• Relying Solely on the Scanner: Consider other diagnostic methods, such as using a multimeter or performing component tests, to confirm the diagnosis.

16. Maintenance and Care: Keeping Your OBD2 Reader in Top Condition

How should you properly maintain and care for your OBD2 reader to ensure its longevity and reliable performance?
To keep your OBD2 reader in top condition, store it in a clean, dry place when not in use. Avoid exposing the scanner to extreme temperatures, moisture, or direct sunlight. Clean the scanner’s screen and buttons with a soft, dry cloth. Inspect the cable and connector for damage regularly. If the scanner has a rechargeable battery, follow the manufacturer’s instructions for charging and storage. According to a report by CAR-TOOL.EDU.VN, proper maintenance and care can extend the lifespan of your OBD2 reader by several years.

• Storage: Store the scanner in a clean, dry place when not in use.
• Cleaning: Clean the screen and buttons with a soft, dry cloth.
• Inspection: Inspect the cable and connector for damage regularly.
• Battery Care: Follow the manufacturer’s instructions for charging and storage.

17. OBD2 Reader and Car Modifications: What You Need to Know

How does using an OBD2 reader relate to car modifications, and what should you consider when modifying your vehicle to ensure compatibility and avoid diagnostic issues?
When modifying your car, it’s essential to consider how the modifications may affect your vehicle’s diagnostic system and whether your OBD2 reader can still accurately read and interpret the data. Some modifications, such as installing aftermarket performance parts or tuning the engine control unit (ECU), can alter the data reported by the vehicle’s sensors and trigger diagnostic trouble codes (DTCs). It’s important to ensure that any modifications are compatible with your OBD2 reader and that you understand how the modifications may affect the diagnostic process. According to the SAE, proper calibration and validation of aftermarket modifications are critical for ensuring accurate diagnostics and avoiding performance issues.

• Compatibility: Ensure that any modifications are compatible with your OBD2 reader.
• Calibration: Properly calibrate and validate aftermarket modifications to ensure accurate diagnostics.
• Understanding: Understand how modifications may affect the diagnostic process.

18. Troubleshooting Common OBD2 Reader Issues: Solutions and Fixes

What are some common issues that can occur with OBD2 readers, and how can you troubleshoot and resolve these problems?
Common issues that can occur with OBD2 readers include connection problems, software errors, and inaccurate readings. Connection problems may be caused by a faulty cable, a damaged connector, or a dirty OBD2 port. Software errors can often be resolved by updating the scanner’s software or performing a factory reset. Inaccurate readings may be caused by a faulty sensor or a problem with the vehicle’s wiring. According to a report by CAR-TOOL.EDU.VN, troubleshooting OBD2 reader issues often involves checking the connections, updating the software, and verifying the accuracy of the readings.

• Connection Problems: Check the cable, connector, and OBD2 port for damage or dirt.
• Software Errors: Update the scanner’s software or perform a factory reset.
• Inaccurate Readings: Verify the accuracy of the readings by comparing them to other diagnostic methods.

19. Where to Buy OBD2 Readers: Online Retailers vs. Local Stores

Where are the best places to buy OBD2 readers, and what are the pros and cons of purchasing from online retailers versus local stores?
OBD2 readers can be purchased from online retailers, such as Amazon and eBay, as well as local auto parts stores, such as AutoZone and O’Reilly Auto Parts. Online retailers typically offer a wider selection of scanners and competitive prices, while local stores provide the opportunity to see the scanner in person and get advice from knowledgeable staff. According to a survey by CAR-TOOL.EDU.VN, most consumers prefer to purchase OBD2 readers from online retailers due to the convenience and wider selection.

• Online Retailers: Wider selection, competitive prices, convenient shopping.
• Local Stores: Opportunity to see the scanner in person, advice from knowledgeable staff, immediate availability.

Online retailers offer a wide selection of OBD2 readers at competitive prices.

20. The Future of OBD2 Readers: Emerging Technologies and Trends

What are the emerging technologies and trends in the field of OBD2 readers, and how will these advancements impact automotive diagnostics in the future?
Emerging technologies and trends in the field of OBD2 readers include cloud-based diagnostics, artificial intelligence (AI)-powered diagnostics, and integration with mobile apps and connected car platforms. Cloud-based diagnostics allows for remote diagnostics and data sharing, while AI-powered diagnostics can help mechanics quickly identify and resolve complex vehicle problems. Integration with mobile apps and connected car platforms provides access to real-time vehicle data and predictive maintenance alerts. According to a report by the Automotive Aftermarket Suppliers Association (AASA), these advancements will revolutionize automotive diagnostics and transform the way vehicles are maintained and repaired in the future.

• Cloud-Based Diagnostics: Remote diagnostics and data sharing.
• AI-Powered Diagnostics: Quick identification and resolution of complex vehicle problems.
• Mobile App Integration: Access to real-time vehicle data and predictive maintenance alerts.

For detailed information, comparisons, and the latest deals on OBD2 readers, visit CAR-TOOL.EDU.VN. Our expert reviews and buying guides will help you choose the perfect tool to diagnose and maintain your vehicle effectively.

Are you struggling to find the right OBD2 reader or other automotive tools and equipment? Contact CAR-TOOL.EDU.VN today for expert advice and personalized recommendations. Our team of experienced technicians can help you find the perfect tools to meet your specific needs and budget. Reach out to us at 456 Elm Street, Dallas, TX 75201, United States, or via WhatsApp at +1 (641) 206-8880. You can also visit our website at CAR-TOOL.EDU.VN for more information. Let CAR-TOOL.EDU.VN be your trusted partner in automotive diagnostics and repair!

FAQ: Everything You Need to Know About OBD2 Readers

What is an OBD2 reader?

An OBD2 reader, also known as a scan tool, is a device used to access a vehicle’s onboard diagnostic system. It helps retrieve diagnostic trouble codes (DTCs) to diagnose and troubleshoot vehicle issues efficiently.

What vehicles are compatible with OBD2 readers?

OBD2 readers are compatible with most cars and light trucks sold in the United States since 1996, as mandated by the Environmental Protection Agency (EPA).

How do I use an OBD2 reader?

To use an OBD2 reader, plug it into the OBD2 port (usually located under the dashboard), turn on the ignition, and follow the reader’s instructions to retrieve diagnostic codes and live data.

Can an OBD2 reader clear check engine lights?

Yes, an OBD2 reader can clear check engine lights by erasing the stored diagnostic trouble codes (DTCs) after you’ve addressed the underlying issue.

What is live data, and how is it useful?

Live data refers to real-time information from your vehicle’s sensors, such as engine RPM, coolant temperature, and oxygen sensor readings. It helps monitor vehicle performance and diagnose issues as they occur.

What is freeze frame data?

Freeze frame data captures a snapshot of your vehicle’s parameters at the moment a DTC is triggered, providing insights into the conditions that caused the issue.

What are the differences between wired and wireless OBD2 readers?

Wired OBD2 readers offer a stable, direct connection, while wireless readers provide greater mobility by connecting via Bluetooth to smartphones or tablets.

What is bi-directional control in an OBD2 reader?

Bi-directional control allows you to send commands to the vehicle’s computer, enabling you to test components like fuel injectors and ABS pumps to verify their functionality.

How often should I update my OBD2 reader?

Update your OBD2 reader regularly (every few months) to ensure compatibility with new vehicle models and access the latest diagnostic protocols and features.

Where can I buy a reliable OBD2 reader?

You can buy reliable OBD2 readers from online retailers like Amazon, eBay, and specialized auto parts stores such as AutoZone and CAR-TOOL.EDU.VN.