When you want to check your engine or ABS system, you need to use a diagnostic scanner. However, not all scanners can access the same components.
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What is a diagnostic scanner?
A diagnostic scanner is a tool that, as its name suggests, diagnoses your car. Paired with diagnostic software, it reads fault codes.
But that’s not all these scanners can do. They can also be used to reprogram your engine, optimize its performance, or simply verify that everything is running correctly.
How does a standalone scanner work?
Similarly, a standalone reader is a car diagnostic tool. What’s the difference with scanners? No external device is needed! The software and display are built right into the reader.
This lets you run a diagnosis without a computer or smartphone.
OBD2 adapters
OBD2 adapters plug into your car’s port and relay data from the ECU to diagnostic software. However, the software isn’t built into the adapter.
Unlike standalone readers, OBD2 adapters require separate diagnostic software to function.
For professionals and DIYers alike
Not every scanner is for everyone—and for good reason! These tools can be quite complex, so you need to know how to use them.
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Professional scanners: tools for technicians
More comprehensive, professional scanners perform full diagnostics on a wide range of vehicles, especially multibrand models.
Brand-specific scanners are typically reserved for dealerships, providing 100% tailored diagnostics for that make. These professional units are also much more expensive.
With starting prices around €400 (plus subscription fees), they’re a serious investment—only justified for pros.
Klavkarr: a multibrand OBD2 scanner
That said, there are multibrand scanners designed for enthusiasts! Take our Klavkarr scanner. It plugs into your car’s OBD port and reads ECU data.
Rental options for scanners
Not everyone needs a scanner year-round. But when your inspection is due, you’ll want a clear picture of what’s under the hood. That’s why scanner rentals via platforms like AlloVoisins have grown in popularity.
You can rent by the hour, day, or week—but as with any rental, there are risks!
A counterfeit scanner might miss critical faults that could cause an accident. And some bundled software may carry viruses.
As with any rental, check the product’s quality before you use it.
Comparing scanners: Klavkarr, ELM327, OBDClick
Clearly, there’s more than one scanner on the market. How do you choose?
It’s important to read a comparison of different scanners to find the one that fits your budget and technical needs.
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In conclusion
Whether you’re a professional or just looking to maintain your car yourself, whether you work on many brands or just one, there’s a diagnostic scanner for you.