Sitemap
Every Cars Diagnostic Tool guide in one place, grouped by topic.
Phone & Bluetooth Adapters
Small plug-in adapters that send car data to your iPhone or Android phone, with app, pairing and coding answers.
Handheld Scanners
Stand-alone code readers with a screen, from simple check engine tools to full-system models, with live data picks and head-to-heads.
- Best Car Diagnostic Tools for Home Use
- Best OBD2 Scanners With Live Data
- ANCEL AD310 vs AD410
- Innova 5210 vs 5610
- BLCKTEC 460T Review
- Innova 5210 OBD2 Scanner Review
Pro-Level Scan Tools
Tablet-style tools from Autel, Topdon, Launch and XTOOL that run active tests and resets, with picks, reviews and comparisons.
- Best Autel Scanners
- Best Professional OBD2 Scanners for Home Garages
- Best Topdon Scanners
- Autel vs Launch Scan Tools
- XTOOL A30M vs A30D
- Autel MaxiCOM MK808S Review
- Topdon AD600S Review
Scan Tools by Car Brand
Picks and answers for BMW, Mercedes, VW and Audi owners, from battery registration to coding adapters.
- BMW Battery Registration Tool: Do You Need One?
- What Is a BimmerCode Adapter and Who Needs One?
- Best Diagnostic Tools for BMW and Mercedes
- Best OBD2 Scanner for VW and Audi
Diagnostics Basics
Plain answers on codes, the check engine light, the OBD2 port and what a shop would charge to scan your car.
- Car Diagnostic Tools: A Plain Buying Guide
- Can I Drive With the Check Engine Light On?
- How Much Does a Car Diagnostic Test Cost?
- How to Clear the Check Engine Light With a Scanner
- How to Read OBD2 Codes From Your Car
- What Does the Check Engine Light Mean?
- What Is Freeze Frame Data on a Scan Tool?
- Where Is the OBD2 Port in a Car?
- OBD1 vs OBD2: What Changed?
- Pending Code vs Stored Code: What Is the Difference?