The Best OBD2 Scanners

It reads the four warning lights you're most likely to see. Engine, ABS, airbag and transmission — most handheld scanners in this range stop at the engine. The 5410 pulls codes from all four and clears them once you've done the repair, so a stubborn airbag light doesn't automatically mean a shop visit. There's no model-year cutoff either. If your car has an OBD2 port, the generic side works.

You don't need a phone to use it. It's a handheld with its own screen and buttons, and that matters more than it sounds like. A dead phone, a cold garage, gloves, a car with a weak battery — none of that stops you. You plug it in, walk through the prompts, and read the answer off the device. The step-by-step menus are written for people who don't do this every week.

The companion app turns a code into a repair. RepairSolutions2 pairs the fault code with verified fixes drawn from a large repair database, plus parts links, maintenance schedules and technical service bulletin lookup. That's the difference between P0420 and a plain description of what usually causes it on your car. Owners lean on this app heavily, and it doesn't cost anything on top of the tool.

Live data is here, and it's genuinely useful. You can watch RPM, fuel trims, coolant and intake temperature, oxygen sensor output and battery voltage while the engine runs. That's how you catch a problem before it sets a code — a lazy O2 sensor, fuel trims drifting rich. It's also the fastest way to confirm a repair actually worked before you put your tools away.

Flaws but not dealbreakers

There's no bi-directional control. It reads and clears; it can't command anything. If you want to cycle an ABS solenoid to prove a valve is dead, or run a cooling fan on demand, you need one of the tablets further down this guide. For most home repairs that never comes up. For chasing an intermittent fault that won't store a code, it's a real limit.

Service resets aren't included. No oil light reset, no electronic parking brake retract, no steering angle calibration, no throttle body relearn. On a lot of newer cars, that means a brake job you did yourself still ends with a trip somewhere else to reset the light. Know that going in.

Coverage varies by make and model, so check first. Innova publishes a coverage checker for exactly this reason. The generic engine side works on anything with an OBD2 port, but ABS and airbag support is written manufacturer by manufacturer, and a less common model can get less than the listing suggests.

It works two ways, and that's the whole trick. Plug it into the port and it's a wired code reader with a display — no pairing, no app, no phone battery to worry about. Pair it over Bluetooth instead and the free app adds live graphs, freeze frame, EVAP and O2 sensor tests, HUD mode and trip data. Most dongles this size make you pick one or the other.

The code explanations are written for people who aren't mechanics. You get a plain-English description of the fault plus built-in search, so a code arrives with some context rather than as a bare number. If this is your first scanner, that's worth more than any spec on the box. Published reviews have singled the BD310 out for exactly this kind of approachability.

Battery monitoring is the quiet reason to keep it in the glovebox. It graphs voltage while you drive, so you can watch the charging system work instead of taking one static reading in the driveway. A slowly failing alternator shows up here long before it strands you in a parking lot. Owners tend to use this more than the code reading itself.

It covers all ten standard OBD2 modes, including I/M readiness. So you can check whether your car will pass an emissions inspection before you drive to the station and waste the trip. App updates are free and ongoing, which means nothing about this tool expires or asks you for money later.

Flaws but not dealbreakers

It's engine-only, full stop. No ABS, no airbag, no TPMS, no transmission. If one of those lights is what sent you shopping, this isn't your tool — step up to the Innova 5410. It's the most common disappointment owners report, and it's right there in the specs if you look.

The good features live in the app. On its own, the device reads and clears engine codes. Graphs, trip analysis, performance timing and battery tracking all need your phone, which is fine right up until you're in a parking garage with a nearly flat battery and no signal.

Active tests are what you're really paying for. Bi-directional control lets you tell the ECU to run a component — ABS solenoids, injectors, window motors, wipers, headlamps — instead of inferring its condition from a code. That's how you separate a dead part from a wiring fault upstream of it. Autel lists more than 3,000 of these tests across the major systems.

The service reset library covers the jobs that usually go back to a shop. Oil service intervals, electronic parking brake, steering angle calibration, battery registration, throttle body adaptation, injector coding, ABS bleeding — 28 and counting. If you do your own brakes on a car with an electric parking brake, that one function can pay for the tool over a couple of jobs.

It's wireless, and the freedom is real. The included MaxiVCI Mini stays in the port while you carry the tablet up to about 33 feet away. You can stand at a wheel during an ABS bleed, or watch a window motor move while you trigger it. With a cable, both of those are two-person jobs or a lot of walking back and forth.

Automatic VIN reading makes full-system scans quick. It identifies the car for you rather than making you tap through year, make and model, then sweeps every module the vehicle exposes. On an unfamiliar car — one you're thinking of buying, or a friend's — that single scan tells you more in a few minutes than an afternoon of guessing.

Flaws but not dealbreakers

It's the kind of tool you have to learn. The menu depth that makes it capable also makes it slow the first few times you pick it up. If what you want is to read a code and get on with your day, you'll find this frustrating rather than powerful.

Special functions aren't universal, and Autel says so. Which resets and active tests work depends on make, model and model year, and Autel asks buyers to send a VIN to support to confirm before ordering. Do that. It's the difference between the tool doing the job you bought it for and just running a generic scan.

Software updates eventually cost money. Autel runs a subscription after the included period, so there's an ongoing cost here that the app-based options in this guide simply don't have.

It's the adapter the serious apps name by name. FORScan for Ford and Lincoln module work, BimmerCode for BMW and Mini coding, AlfaOBD for Fiat, Jeep, Chrysler and Alfa, plus Carista, Torque and DashCommand. No other dongle here is the recommended hardware for all of them at once. If you already know which app you need, this is the whole decision.

Enhanced OEM protocol support is the actual hardware difference. Beyond generic OBD2, it decodes manufacturer-specific data for Ford, GM, Mazda, Nissan and Infiniti, Toyota, Lexus and Scion, Honda, Hyundai and Kia. Cheap ELM327 clones can't reach those streams, which is why they miss codes and report shaky live data on European and some Japanese cars.

It works properly on an iPhone, which is not a given. Plenty of clone adapters simply fail on iOS. The MX+ is built for stable iPhone connections alongside Android and Windows, so you're not locked to one device or one household phone. Firmware updates are included and there's no annual fee attached to the hardware.

It protects itself and your battery. Over-voltage protection and low-power sleep mean you can leave it plugged in between drives without waking up to a car that won't crank. That's unglamorous, but a parasitic drain from a cheap dongle left in the port is the failure people actually run into.

Flaws but not dealbreakers

No screen means no scanner without a phone. Nothing happens until you've chosen an app, installed it and paired. That's extra setup, and some of the best apps cost money on top of the adapter. If you want to plug in and read a code cold, buy the Innova or the ANCEL instead.

It's the most expensive dongle here and it ships without software. You're buying an interface, not a finished tool. For someone who just wants the check engine light explained, that's a lot to spend on hardware that does nothing on its own.