Super Auto Mall

Buying guide

The best OBD2 scanners, from simple code readers to full scan tools

What is the best OBD2 scanner to buy?

The best OBD2 scanner is the one that matches how deep you want to go: a basic code reader to clear a check-engine light, a Bluetooth dongle that pairs with your phone, or a full scan tool that reads live data and more than just the engine. This guide helps you choose by skill level and use, including the quick scan that can save you from buying a used car with a hidden problem. We focus on what each type actually does so you do not overpay for features you will never touch.

Jump to the picks All buying guides

How we picked

Our selection criteria

These are research-based buyer's guides. We have not hands-tested every item; instead we apply consistent, honest criteria so the picks point you in the right direction.

Our picks

What to consider

Super Auto Mall is reader-supported. The links below are affiliate links, so we may earn a commission when you buy through them, at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. We only point to gear we would use on our own cars.

Basic plug-in code reader

A simple handheld reader plugs into the OBD2 port, pulls trouble codes, and clears the check-engine light, which covers what most owners ever need. It works on its own screen with no app or pairing, so it is the easy, no-fuss pick for the glovebox.

Best for: Owners who just want to read and clear codes

Check price on Amazon

Bluetooth OBD2 dongle

A small Bluetooth adapter plugs into the port and sends data to a phone app, turning your phone into a live dashboard for codes, speed, and sensor readings. It is inexpensive and tidy, though it depends on a compatible app and a phone that stays paired.

Best for: Phone-first owners who want live data on a budget

Check price on Amazon

Full-feature scan tool

A higher-end scan tool reads beyond the engine, into ABS, airbag, and other modules, and shows live data and freeze-frame information on its own large screen. It costs more, but it is the tool that actually diagnoses a problem rather than just naming a code.

Best for: Serious DIYers and frequent diagnosing

Check price on Amazon

Pre-purchase used-car scanner

For checking a used car, a reader that shows both stored and pending codes, plus readiness monitors, can reveal a fault the seller cleared or a check-engine light that is about to return. A quick scan in the driveway is cheap insurance before you hand over money.

Best for: Vetting a used car before you buy

Check price on Amazon

Mechanic-grade diagnostic scanner

A professional-tier scanner adds bidirectional controls, service resets, and broad module coverage for people who work on cars regularly. It is overkill for clearing the occasional light, but it pays off if you maintain several vehicles or do your own repairs.

Best for: Heavy DIY use and multi-car households

Check price on Amazon

At a glance

Compare the picks

Pick Typical price Best for
Basic code reader Low Read and clear codes
Bluetooth dongle Low Phone-based live data
Full-feature scan tool Mid to high Real diagnosis beyond the engine
Pre-purchase scanner Low Checking a used car
Mechanic-grade scanner High Frequent DIY repairs

Questions

Frequently asked questions

What does an OBD2 scanner actually do?
An OBD2 scanner plugs into the diagnostic port (usually under the dash) and reads the trouble codes your car's computer stores when something is wrong, such as a check-engine light. Basic readers show and clear engine codes; more capable tools also read ABS and airbag systems, show live sensor data, and display freeze-frame data that captures conditions when a fault occurred.
Will any OBD2 scanner work on my car?
Almost all cars and light trucks sold in the United States from 1996 onward use the standard OBD2 port, so a basic OBD2 scanner will read engine codes on nearly any of them. Coverage for ABS, airbag, and manufacturer-specific systems varies by tool and brand, so if you need more than engine codes, confirm the scanner lists support for your make and the systems you care about.
Should I use an OBD2 scanner when buying a used car?
Yes, it is one of the cheapest checks you can make. Reading stored and pending codes and the readiness monitors can reveal a fault the seller recently cleared or a check-engine light that is about to come back on. It does not replace a mechanic's pre-purchase inspection, but a quick scan in the driveway can flag a problem before you commit money.
Is a Bluetooth OBD2 dongle as good as a standalone scanner?
For live data and reading codes on a budget, a Bluetooth dongle paired with a good app is excellent and very compact. The tradeoffs are that it relies on your phone staying connected and on app compatibility, and cheaper dongles can be hit or miss. A standalone tool works on its own screen with nothing to install, which some owners prefer for reliability.
Can clearing a code with a scanner fix the problem?
No. Clearing a code turns off the warning light, but if the underlying issue remains, the code and the light will usually return. Use the scanner to identify the fault, address the actual cause, and only then clear the code to confirm it stays off. Clearing codes to hide a problem before selling a car is exactly what a careful used-car scan is meant to catch.

Keep exploring

Super Auto Mall is reader-supported. Some links on this site are affiliate links, which means we may earn a small commission when you use them, at no extra cost to you. We only point to dealers, lenders, and tools we would use to buy our own cars. We are not a dealer and do not sell vehicles.