Short answer: the Autel MaxiCOM MK808S if you want one tool that reaches every module on the car, and the Innova 5610 if the reason you are shopping is a transmission or CVT warning — Innova is the maker on this page that publishes transmission live data including temperature, which is the number a CVT owner actually wants to watch. If your light is the plain check engine light and nothing else, the FOXWELL NT301 reads it for a fraction of either price.
What we judged these on
1. Does it publish transmission coverage, and temperature?
A transmission fault code lives in the transmission control module, and reading it needs a tool whose maker built that access. Innova publishes engine, transmission, ABS and SRS, and specifically names transmission temperature in its live-data list. BlueDriver publishes enhanced transmission. Autel publishes all-system. FOXWELL and the AutoLink AL319 publish engine systems, and that is where they stop. If you want the whole argument for why temperature is the figure worth having rather than another code, best OBD2 scanner for transmission takes it apart properly.
2. ABS and airbag, on an all-wheel drive car
An all-wheel drive Subaru leans on wheel-speed data for more than just the brakes, so an ABS fault is worth reading rather than living with, and an airbag light means a restraint system has taken itself out of service. Three of the five tools here publish SRS and ABS access; two do not. That is the line that decides whether a cheap tool is a bargain or a dead end for your particular light.
3. Read, or command?
Bi-directional control means the tool can tell a module to act — cycle a solenoid, run a pump, perform a reset — instead of only asking what is wrong. Autel, Innova and TOPDON publish it; BlueDriver and the two basic readers do not. Bidirectional vs basic OBD2 scanners is the full explanation of what the capability buys a home mechanic.
4. Who publishes a coverage statement at all?
BlueDriver publishes a compatibility checker, which is the only per-vehicle answer available from any maker here. Innova publishes a territory limit — US and Canada — which is a real constraint worth reading if your car was imported. Nobody publishes a Subaru model-year matrix. We have not plugged any of these tools into a Subaru, so we will not invent that table for you; how we review explains what our scores rest on.
5. What it costs in year two
Innova publishes free updates. BlueDriver publishes no subscription. FOXWELL and the AL319 are standalone handhelds with nothing to renew. Autel's update terms vary by model and region. A diagnostic tool that stops being updated stops recognizing newer cars, so this is a specification rather than a footnote.
The five picks on published coverage
| Scanner | Systems published | Transmission temperature | Bi-directional | Subscription |
|---|---|---|---|---|
| Autel MaxiCOM MK808S | All-system | Not named | Yes | Varies by model |
| Innova 5610 CarScan Pro | Engine, transmission, ABS, SRS | Yes | Yes | Free updates |
| BlueDriver Pro | Enhanced ABS, SRS, transmission | Not named | No | None |
| FOXWELL NT301 | Engine (CAN OBDII / EOBD) | No | No | None |
| Autel AutoLink AL319 | Engine (OBD2 1996+) | No | No | None |
The second and third columns are the Subaru columns. If your warning is the transmission or CVT, read across row two. If it is a plain engine light, rows four and five do the job and save you the difference.
Start from the light, not the price
The cheapest useful purchase depends entirely on which warning you are looking at, so work in this order. A check engine light on its own: any tool on this page reads it, so buy the FOXWELL NT301 or the AL319 and stop. A transmission or CVT warning: you need published transmission coverage, which narrows it to the Innova, the BlueDriver or the Autel. An airbag or ABS light: the same three tools, for the same reason. A car you intend to keep for years and service yourself: the Autel, because the service-reset list is what you will use after the diagnosis.
One more case worth naming, because it is common and nobody sells for it: a pre-purchase check on a used Subaru. There the useful tool is the small one you can carry in a jacket pocket and plug in during a test drive — the AL319 — and what you are looking for is not just codes but readiness monitors, because a seller who cleared the codes this morning leaves monitors showing "not ready" behind. How to use an OBD2 scanner covers reading those.
What we cannot tell you
Which Subaru model years each tool reaches, module by module. No maker here publishes that at the level we would need to reproduce it, and we have not tested these tools on a Subaru. Subaru publishes its own service information through its Technical Information System, which is a subscription service aimed at the trade rather than a home purchase. Before you buy a scanner for a specific car, run the vehicle through BlueDriver's published compatibility checker — even if you end up buying a different tool, it is the only free, vehicle-specific coverage answer on offer.
What we would buy
For a Subaru owner with a CVT and a plan to keep the car: the Innova 5610, for published transmission temperature and free updates — it answers the question Subaru owners actually have, for a price that is not an argument. For one tool that covers everything and leaves you able to finish jobs as well as diagnose them: the Autel MaxiCOM MK808S. For a phone-based tool you can verify against your own VIN first: BlueDriver Pro. For a single engine light: the FOXWELL NT301, or the AutoLink AL319 if you want it small enough to live in the car.