Best OBD-II scanners for DIY car owners
Last updated June 23, 2026
The right scanner depends on what you want to do — just read and clear a check engine light, or dig into live data and bidirectional tests. Here’s how to choose, by budget and use case.
How we pick: we weigh reliability, read/clear accuracy, live-data support, app quality, and value. Affiliate links help support the site at no extra cost to you.
Best budget code reader (under $30)
For most people whose only goal is to read and clear codes, a simple plug-in reader is all you need. Look for one that shows the code plus its definition and supports freeze-frame data.
- Best for: reading the check engine light, clearing codes after a repair.
- Skip if: you want live sensor graphs or ABS/airbag access.
Best Bluetooth dongle (phone app)
A Bluetooth dongle pairs with your phone and turns it into a capable scanner with live data, often for less than a dedicated tool. Quality varies a lot — choose a well-reviewed brand and a paid app with good support.
- Best for: live data, logging, a clean interface on your phone.
- Watch for: cheap clones with flaky connections.
Best all-rounder (handheld, $60–$150)
A mid-range handheld adds live data graphing, readiness-monitor status for emissions, and broader coverage in a rugged package that doesn’t rely on your phone.
- Best for: DIYers who diagnose regularly across a couple of vehicles.
Best bidirectional / pro tool ($200+)
Bidirectional tools can command components — cycle an EVAP valve, bleed ABS, run actuator tests — plus access ABS, airbag, and other modules. Overkill for a single check engine light, essential for serious work.
- Best for: advanced diagnostics and module-level work.
How to use your new scanner
Once you’ve picked one, our guide covers how to read OBD-II codes with a scanner step by step — then look up whatever you find in our code database.