Livraison le jour même ou le lendemain
Qualité garantie
Débloquez vos offres de bienvenue: Livraison GRATUITE | Jusqu'à -80 % | 30 jours d'essai gratuits à JoyPlus
Téléchargez l'application
A bidirectional OBD2 car diagnostic scanner does more than just read a check engine light. Depending on the model, it can access multiple control units, display live data, command certain components and carry out various maintenance operations. However, product listings sometimes blur the lines between what's actually available, theoretical compatibility and subscription-based features.
Before buying a diagnostic tool, check three things: compatibility with your vehicle, the features genuinely included and the cost of updates.
A basic fault code reader typically only reads and clears engine-related codes. When compatible with the vehicle, a bidirectional device can send commands to the control unit: activating a fuel pump, a fan, an air conditioning relay, a door lock or a window regulator.
However, the term "bidirectional" doesn't mean every component can be commanded on every car. The possibilities depend on the make, model, year of manufacture, engine and control unit fitted.
All-systems diagnostics can cover the engine, transmission, ABS, SRS, air conditioning, TPMS, EPB and body control modules. With a multi-brand tool, some vehicles may only give you access to a subset of these systems.
To avoid nasty surprises, provide the VIN to the seller before purchase if you need a specific function, such as ECU coding, DPF regeneration or ABS bleeding.
Some devices include lifetime free updates. Others offer a limited update period, then reserve advanced features for subscribed users. You also need to distinguish between fees charged by the manufacturer and those potentially demanded by a car manufacturer.
For example, access to FCA AutoAuth may require a separate account and subscription for certain Fiat, Chrysler, Dodge, Jeep or Ram vehicles. This cost isn't necessarily part of the scanner's price.
Look for a 16-pin OBD2 connector and check the protocols your car supports. CAN FD compatibility applies to some newer vehicle networks and could save you buying an extra adapter. The DoIP protocol, found on certain models, relies on communication via the automotive Ethernet network.
For vehicles protected by a security gateway, also check support for FCA AutoAuth or equivalent access. A stable connection is essential during active testing or coding operations.
There's no point paying for a long list of functions if you'll only use two. The most common operations include:
These functions don't replace a repair. Clearing a fault code doesn't make the cause of the problem disappear: if the fault returns, further investigation is needed.
For home use, a mobile app can be perfectly adequate. Models with a built-in tablet are more practical in a workshop, especially when wearing gloves or during long sessions. Compare screen size, memory, battery life, Bluetooth connection and the number of parameters that can be displayed simultaneously.
Live data graphs, parameter recording and report export are particularly useful for comparing a vehicle before and after a repair, or for monitoring several cars within a fleet.
Why this suits this profile: Its touchscreen, guided functions and PDF reports make it a relevant first diagnostic tool for routine maintenance.
The listing details compatibility limits and states that updates are included with no annual fees.
Engine, transmission, ABS and SRS diagnostics, live data, EPB, TPMS and throttle adaptation functions depending on the vehicle.
Why this suits this profile: This wireless unit connects to an Android or iOS device and offers extensive coverage for multiple brands.
The listing distinguishes functions available depending on the vehicle and highlights special conditions related to FCA AutoAuth.
Bidirectional active testing, all-systems diagnostics, CAN FD support and nineteen announced reset functions.
Why this suits this profile: Its 17.8 cm tablet, built-in memory and numerous maintenance functions are aimed at regular users.
The listing states that services vary by model and that included updates are time-limited.
Bidirectional control, diagnostics for many systems, DPF, ABS, EPB functions and injector coding according to the stated coverage.
Why this suits this profile: Its 20.3 cm tablet, VCI interface and expansion options suit an independent workshop or fleet management.
The listing mentions compatibility limits, the stated warranty and the absence of subscription fees for updates.
ECU coding, bidirectional tests, CAN FD, DoIP, over thirty announced maintenance functions and extensions for TPMS or oscilloscope.
We've put together a comprehensive, real-time updated selection of products that meet these strict criteria and European safety requirements.
A connection is generally needed for activation, software downloads, updates, certain databases and secure access. Depending on the device, local code reading may then work without a network. Check the specific conditions for the app or tablet.
It depends on the battery, the connector, storage conditions and frequency of use. A wired model avoids recharging, while a wireless device should be stored with a sufficiently charged battery. Free updates extend the software's usefulness, but don't guarantee support for every new vehicle.
It makes diagnostics and certain maintenance operations easier, but doesn't replace mechanical skills or manufacturer procedures. For brakes, airbags, ECU coding or DPF regeneration, only use the tool if its compatibility is confirmed and you understand the necessary precautions.