Best OBD2 scanners: code readers and Bluetooth apps

When the check engine light comes on, an OBD2 scanner tells you which fault code the car has stored, so you know whether it is a loose fuel cap or something that needs a garage soon. We chose these from published reviews and manufacturer specs; we haven't tested them ourselves yet.

What OBD2 is, and which cars have it

OBD2 (on-board diagnostics, second generation) is a standard computer system that watches the engine and emissions parts and stores a code when something goes wrong. Cars that have it use a standard socket and standard basic codes, so one scanner works across brands.

• US: The EPA describes OBD as built into all model year 1996 and newer light-duty cars and trucks. Diesel cars and light trucks had until the 1997 model year.
• EU and UK: The European version, EOBD, applies to petrol cars from 1 January 2001 and diesel cars from 2004. Some new diesel models had it from 2003, so a 2003 diesel may or may not work.
• Elsewhere, or if unsure: Check the scanner maker's compatibility list for your exact car.

A basic scanner reads engine and emissions codes. Brake (ABS), airbag (SRS) and transmission codes are "enhanced" codes that only some scanners read, and often only on some brands.

Our picks

Best simple handheld

Innova CarScan Advisor 5210

Approximate price: about $100

• Reads and clears engine and ABS codes
• Battery and charging system test
• Live data, oil light reset
• No phone needed; no airbag (SRS) codes

A plug-in handheld for drivers who want answers without an app. Motor1 gave it four stars and called it low-cost and easy to use, with links to suggested repairs based on the codes it finds. It may not support every feature on newer luxury and hybrid models.

See it at innova.com ↗

Best phone-based scanner (US cars)

BlueDriver Bluetooth Pro

Approximate price: about $100

• Bluetooth, iOS and Android app
• Engine codes plus ABS, airbag and transmission on many makes
• Repair reports, live data, smog-check readiness
• No subscription fees

A small adapter that stays in the port while your phone does the work. The Drive named it the best scanner for smartphones, and BlueDriver says there are no in-app fees. It is built for vehicles sold in North America from 1996, so drivers elsewhere should look at the OBDLink MX+. BlueDriver's own store showed it out of stock when we checked, so you may need to buy it from a retailer.

See it at us.bluedriver.com ↗

Best Bluetooth for UK, EU and enthusiasts

OBDLink MX+

Approximate price: about $140

• Bluetooth; iOS, Android and Windows
• Supports EOBD and other international OBD2 variants
• Works with free OBDLink app and many third-party apps
• Free manufacturer-specific add-ons, 3-year warranty

The Drive tested it and found the connection fast and the live data accurate, with customizable gauges. It costs more than basic adapters, and some advanced checks need third-party apps. It suits drivers outside North America and anyone who likes to watch live engine data.

See it at obdlink.com ↗

Most capable

Innova CarScan Pro 5610

Approximate price: about $350

• Engine, ABS and airbag (SRS) codes
• Battery and charging system test
• Live data with graphing, record and playback
• Oil light reset; Bluetooth link to Innova app

A step up for home mechanics who want airbag codes and recorded live data. A retired shop owner who tried it for Vehicle Service Pros liked its ease of use and the built-in repair information, though he found the on-screen text small. Most drivers will not need this much.

See it at innova.com ↗

What to look for

• Handheld or Bluetooth. A handheld has its own screen and works without a phone. A Bluetooth adapter is smaller and uses an app, which often explains codes in plain language.
• Your region. Check that the scanner supports your market. Some tools are designed for North American cars; others list EOBD support for Europe.
• Which systems it reads. Engine codes are standard. If you want brake, airbag or transmission codes, check that the scanner supports them on your make and model year.
• Ongoing costs. Some apps charge yearly for extra features. Read the small print before you buy.
• Very cheap readers. In its 2026 test, Auto Express found a wired reader costing around £10 could read and clear a basic engine code. That is enough to identify a simple fault, but you get less help explaining it.

A scanner tells you what the car has detected, not always what is broken. Use the code as a starting point, and see our check engine light guide for what to do next. If the light is flashing, slow down and stop when it is safe.