There aren’t any hard and fast rules as to what constitutes a basic car code reader and what qualifies as a scan tool (like Fixd), but there are a few things that set these devices apart. Both devices feature basic code reading and clearing functionality, but that’s often where a code reader’s feature set ends. Scan tools, on the other hand, may include advanced data reading and playback features, extensive knowledge bases, diagnostic procedures, and even built-in testing equipment.
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As to whether you need a code reader or a scan tool, neither device is necessarily better than the other. Code readers are cheap and easy to use. If all you need to do is read and clear codes, then an inexpensive code reader is a great tool to have.
Some affordable code readers even provide basic access to the full range of parameter IDs (PIDs) that your car’s onboard computer provides, and that can be powerful information if you know what to do with it.
A lot of parts stores and shops will check and clear your codes for free, so folks who would do fine with a bargain-basement code reader could be better off looking into that sort of service
However, a good scan tool is always going to be a much more useful tool in the right hands. Scan tools are more expensive, but they do everything a code reader can do and a lot more. You might also want to consider going with a low-cost option like an ELM327 scan tool if you already have a compatible device that you can use with it.
No two code readers are exactly alike, and feature sets can differ from one model to another. In general, there are some things every code reader can do, other functions that you should be on the lookout for, and a lot of stuff that no inexpensive code reader can handle.
Things a code reader can do:
Things a code reader may be able to do:
Things a basic code reader can't do:
Different scan tools provide a wildly varying set of features depending on whether you’re dealing with consumer- or professional-grade equipment. Like code readers, scan tools allow you to read and clear codes.
However, even low-end, consumer-grade scan tools include information such as code definitions and some basic troubleshooting tips. High-end scan tools include much more in-depth diagnostic and troubleshooting procedures, and some of them have built-in testing equipment like scopes and multimeters.
If you buy a code reader and feel like it isn’t doing what you need it to do, then you probably ended up with a bare-bones device that is nothing more than the dictionary definition of a code reader. If you need to read anything but generic, hard-set codes, or do anything other than read and clear codes, then a basic code reader isn’t going to do the trick. However, a midrange device that can read and display PIDs and freeze-frame data may fit your needs just fine.
Another option that may be worth exploring is a type of scan tool that functions as an interface between your car’s onboard computer and another device, like a smartphone, tablet, or laptop. These are typically referred to as ELM327 scan tools, but they can function as anything from a basic code reader to an advanced scan tool and the core of a DIY infotainment system depending on the software you use.
Professional automotive technicians typically require high-quality scan tools to work efficiently, while the average do-it-yourselfer should be able to get by with a basic code reader or nothing at all.
If you prefer to work on your own car, then the type of scanner or reader to get is a function of how much money you want to spend and how much money or time that purchase can save you.
Spending a lot of money on a decent consumer-grade scan tool certainly makes sense if you own a small fleet of vehicles, while others should be able to get by with the free code reading service offered by a local parts store and an internet search to find out what their trouble codes mean.
April 08, 2019:
OBD2 scanners take all the guesswork out of diagnosing most vehicle problems. If you ever had a check engine light turn or, or almost any other dashboard light for that matter, you can use on these tools to determine what you need to fix, and then reset the fault light afterwards. If you are a professional mechanic, you will most likely be best served with one of the feature-packed models, so you never run across an error code you can't fix. Your best options will be the Autel MaxiCom MK808TS, Innova 3150f, Launch CRP123, and Foxwell NT301. Home DIYers who want to be able to diagnosis and fix their own vehicles may not need a model that works with every car make. They also may not want to pay extra money for something that can take snapshot of the information for later recall. The Ancel AD310 Classic, Autel AL519, and ScanTool 425801 are more budget-friendly models that will be capable enough for most users. The Lemur Vehicle Monitors BlueDriver, BAFX Products 3127, and ScanTool 427201 are also ideal for the average car owner, since you can leave them plugged into your vehicle at all times and can check sensor status on your phone whenever you need to.