How to Choose an OBD2 Scanner
A plain-English, five-step guide to picking the right diagnostic scanner for your car, your skills and your budget – without paying for features you'll never use.
Read the guideBuyer’s Guides
Learn before you buy
Short, plain-English guides that explain what scanners do, what the codes mean, and how to avoid paying for features you don’t need.
OBD2 Explained: What Your Check Engine Light Is Telling You
What OBD2 is, where the port is, what a code like P0420 actually means, and why clearing the light doesn't fix the problem.
Read the guideScanner Subscriptions and Update Fees: What Each Tool Really Costs
The price on the box isn't always the whole story. Here's how scanner updates and subscriptions work, and what the 12 tools we cover cost to keep using.
Read the guideDongle, Handheld or Tablet: Which Scanner Style Fits You?
Bluetooth dongles, handheld scanners and tablets can all read your check engine light. Here's how they differ in everyday use – and which one suits the way you work on your car.
Read the guideABS, Airbag and Transmission Codes: When a Code Reader Isn't Enough
Your ABS or airbag light is on, but your code reader says "no codes." Here's why, what those lights mean, and which scanners can read the systems behind them.
Read the guideWhat Is a Bidirectional Scan Tool? Active Tests and Service Resets Explained
Most scanners only listen to your car. Bidirectional tools can also command parts on and off and run the resets many repairs need. Here's what that means and whether you need it.
Read the guideWill a Scanner Work on My Car? A Compatibility Checklist
How to tell whether an OBD2 scanner will work on your car before you buy – model years, brands, security gateways, newer networks, hybrids and EVs, and each tool's coverage.
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