There are many OBD II scan tools in the market today, and the companies making them are even rising in number. Some are more expensive than the others, of course, because they have more special features. These scan tools are priced from $ 250 to $ 2500 today, and to ensure that you end up with the right purchase, there are some things for you to consider.

First of all, make sure the scan tool you purchase is compatible with your automobile. Although OBD II is a standard auto diagnostic system, OBD II-compliant vehicles work with three distinctive hardware communication types. Some scanners are compatible with all three, hence, they are called universal scanners; but there are those that are manufacturer-specific. For example, X-brand cars only use Y-type scan tools and not any other.

On top of that, it is also important to be aware of the parameters that the Haynes repair manuals supported. Similar data about this are described at http://en.wikipedia.org/wiki/OBD-II_PIDs. Scan tools in the market are certainly not all the same nor even comparable. The US Environmental Protection Agency mandated Clymer Repair Manuals models to support an OBD standard that requires some emission-related readings. Defining this law is the J1979 SAE specification. But some low-end tools do not have such features, and that makes them inapplicable in America. They may be useful in other countries though.

Another issue you should ensure is that the automotive repair manuals you're buying are upgradable. Auto manufacturers release new models each year with new features, and that means scan tools should also be upgradable so they can continue to be useful. Unfortunately, most basic scanners cannot be upgraded, so getting a more expensive yet robust tool is a wiser option.

Furthermore, also look into the built-in help feature of the obd2 tool you're buying. To prevent confusion, pick an outboard engine repair that is able to define the DTCs so that confusion may be avoided. Additionally, this also controls delays and frustrations due to indecipherable scan results.

Finally, also check the data logging and storage process of the scanner you plan to buy. It can be dangerous to focus on the scan tool display while you're on a road test. Pick a scanner that allows data storage while your car is still in the garage. If you're unfamiliar with the specs, you can always consult an expert.

Most probably, an expert will advise you to prioritize quality over price when you buy an obdii scanning tool. The basics are less expensive, but that's exactly why they are basic. There's nothing much they can offer. If you want high quality service, don't think twice about paying the price. It's going to be an investment for convenient and safety.