OBD-II Scanner Guide: How to Choose One & Use It Correctly

Your check engine light just came on. You need to read the codes. But which OBD-II scanner should you buy? How do you use it? What features do you need?

OBD2 scanners get 91,000 monthly searches. Here's everything you need to know.

OBD-II Scanner Types

Basic Code Readers

What they do:

• Read and clear codes
• Basic code definitions
• Check engine light reset

Best for: Beginners, occasional use Price: $20-50 Limitations:

• Only reads powertrain codes (P-codes)
• No live data
• Limited functionality

Professional Scanners

What they do:

• Read all codes (P, B, C, U codes)
• Live data streaming
• Advanced diagnostics
• Module-specific functions

Best for: Professionals, serious DIYers Price: $500-2,000+ Limitations:

• Expensive
• Steep learning curve
• Overkill for basic use

Bluetooth/WiFi Scanners + Apps

What they do:

• Connect to smartphone/tablet
• Use app for interface
• Live data, code reading
• Often includes advanced features

Best for: Most DIYers Price: $20-150 (scanner) + app cost Limitations:

• Requires smartphone/tablet
• App quality varies

Bluetooth vs. Wired vs. App-Based

Bluetooth Scanners

Pros:

• Wireless connection
• Works with multiple devices
• Good range
• Affordable

Cons:

• Requires Bluetooth-enabled device
• Battery powered (needs charging)
• Can have connection issues

Best for: Most users

WiFi Scanners

Pros:

• Faster data transfer
• More stable connection
• Works with tablets

Cons:

• More expensive
• Can interfere with home WiFi
• Less common

Best for: Users who want faster data

Wired Scanners

Pros:

• Most reliable connection
• No battery issues
• Professional-grade options

Cons:

• Less convenient
• Cable can be awkward
• Usually more expensive

Best for: Professional use, when reliability is critical

App-Based (Phone/Tablet)

Pros:

• Large, easy-to-use interface
• Regular updates
• Advanced features
• Cost-effective

Cons:

• Requires compatible device
• App quality varies
• Some apps require subscription

Best for: Most DIYers

What to Look For When Buying

Compatibility

Check:

• Works with your vehicle (1996+ for OBD-II)
• Protocol support (CAN, ISO, etc.)
• App compatibility (if app-based)

Features

Essential:

• Read codes
• Clear codes
• Code definitions

Nice to have:

• Live data
• Freeze frame data
• Readiness monitors
• Module-specific functions

Price vs. Value

Under $50:

• Basic code readers
• Bluetooth scanners
• Good for beginners

$50-200:

• Better Bluetooth scanners
• More features
• Best value for most users

$200-500:

• Professional-grade features
• Better build quality
• For serious DIYers

$500+:

• Professional scanners
• Advanced diagnostics
• For professionals

Step-by-Step: How to Read Your Own Codes

Using a Basic Code Reader

1. Locate OBD-II port - Usually under dashboard, driver's side
2. Plug in scanner - Connect to OBD-II port
3. Turn on ignition - Don't start engine (unless scanner requires it)
4. Read codes - Follow scanner instructions
5. Write down codes - Note all codes displayed
6. Look up codes - Use code definitions or online database
7. Clear codes - Only after fixing the problem

Using Bluetooth Scanner + App

1. Plug scanner into OBD-II port
2. Turn on vehicle - Start engine or turn to "on"
3. Open app on phone/tablet
4. Pair scanner - Via Bluetooth settings
5. Connect in app - Select your scanner
6. Read codes - App will display codes
7. View code details - App provides definitions
8. Clear codes - Through app interface

Top Scanners for DIYers

Under $100

FIXD OBD-II Scanner

• Price: $60
• Features: Bluetooth, app-based, code definitions
• Best for: Beginners

BlueDriver Bluetooth Scanner

• Price: $99
• Features: Bluetooth, comprehensive app, live data
• Best for: Most DIYers

$100-500

Autel MaxiCOM MK808

• Price: $200-300
• Features: Professional features, all code types
• Best for: Serious DIYers

Innova 3160g

• Price: $150-200
• Features: Color screen, all code types, live data
• Best for: Intermediate users

When a DIY Scanner Isn't Enough

You need a professional scanner when:

• Basic scanner doesn't read your codes
• You need module-specific functions
• You need advanced diagnostics
• You're working on complex systems

What to do:

• Take to professional mechanic
• Pay for diagnostic ($100-200)
• Get detailed report
• Decide on repairs

Common Mistakes to Avoid

1. Clearing codes before fixing problem - Only clear after repair
2. Not writing down codes - You'll need them for reference
3. Ignoring pending codes - They indicate developing problems
4. Using wrong scanner - Make sure it's compatible
5. Not updating app - Keep scanner/app updated

The Bottom Line

OBD-II scanners are essential tools for car owners. For most DIYers, a Bluetooth scanner with a good app ($50-150) is the best value. Start basic, upgrade if needed.

Want to see how SKANYX compares to other scanners? Check out our features and see our pricing to find the best diagnostic solution for your needs.

Need Help Choosing a Scanner? Join the Skanyx waitlist to get personalized scanner recommendations based on your vehicle and needs, plus step-by-step diagnostic guidance. Learn more about SKANYX features or see our pricing to get started.