The Difference between a Diagnostic Scan Tool and a Code Reader

Is a diagnostic scan tool the same as a code reader? This is something that many people wonder, as these two terms are often used interchangeably by many. The short answer to the question is – no. While there is a certain amount of overlap between the two tools in terms of functionality, they are not quite the same in terms of features and what they are capable of doing. 

In this article, we take a look at the difference between a diagnostic scan tool and a code reader. 

The Common Features

First, let us take a look at the common features between the two tools. Both a diagnostic scanner and a code reader can read and clear error codes. As you probably already know, your vehicle has an OBD (onboard diagnostics) which is in charge of most of the systems including fuel injection, automatic transmission, ignition, and many more. Sensors located throughout the vehicle send data to OBD to make sure the vehicle functions as efficiently as possible. Whenever there is a problem with the vehicle, the OBD detects it, makes a note of it in the form of an error code, and alerts you by flashing the check engine light or any other indicator. 

Now, the job of a diagnostic scan tool or a code reader is to communicate with the OBD, read the error code, and display it so that you can locate the source of the problem. These tools are also capable of clearing the error codes, which is a very important feature as well. If the error code is not cleared, the check engine light might still be on, even after the issue has been resolved. The similarity between the two types of tools ends right here. 

The Differences

A code reader, as the name itself indicates, is designed to read and clear the error code. You have to find out what the code means by checking the instruction manual or by doing an online search. 

A diagnostic scanner, on the other hand, can do a lot more than merely reading and clearing codes. It can display the error code as well as its definition, so you do not have to go online or reach for the manual to find out what the code means. It can also show you the live data from the sensors in your vehicle, which can be very helpful in diagnosing the problem. It also has the capability to record and play back live data. 

A diagnostic tool is also capable of reading manufacturer or pending codes, which a normal code reader cannot read. It also provides you with troubleshooting information and tips, which makes it easier for you to locate and fix the problem with your vehicle. 

The most advanced diagnostic tools available on the market today are actually capable of doing a lot more and they even come with built-in testing equipment like multi-meters. These are, however, professional grade equipments that are meant for a workshop like setting. 

Diagnostic Scan Tool vs. Code Reader

So, which one is the right choice for you? It depends on two important factors – your budget and your technical knowledge. 

A basic code reader is cheap and can fit within the smallest of budgets. A diagnostic scanner, on the other hand, is more expensive. Similarly, a code reader is very easy to operate whereas you need a little bit of technical knowledge to be able to use a mid-level or advanced diagnostic tool. So, you should keep these factors in mind while choosing a tool for your vehicle. 

Remember – it is not a question of one tool being better or worse than the other. A code reader and a diagnostic scanner simply differ in their range of features and functionality. So, you really cannot go wrong with either of them. 

If you do decide to go for a diagnostic scan tool, make sure you buy from a reputed, reliable manufacturer. A high quality scanning tool is a long term investment and can last you a long time if used and maintained properly. You will also get back the money you spend on the tool, as you can save yourself a trip to the workshop nearby every time there is a problem with your vehicle.