How Do You Run A Full Diagnostic On A Car

Vehicles hold an important place in people’s everyday life. They travel around the streets for work or leisure with the help of these vehicles. Earlier, two-wheelers and taxis were great and topmost options for these purposes.

But as the technology and the need for convenience marched rapidly, cars came into the picture. Today, cars have become a need rather than a demand or desire. With comparatively bigger size than rickshaws & two-wheelers, the greatness also comes in care and maintenance of the car.

Over time, a driver is required to keep an eye on the car’s system regularly. Many components can fail quickly without any indication. Proper oiling and servicing are essential when it comes to the life of a vehicle, especially a car. But, these problems can easily be detected and fixed by running a car diagnostic test through different tools.

Over the years, different car diagnostic test tools have been introduced. Tools like agriculture diagnostic tools for agricultural vehicles provide ease of use and less time consumption. A person can approach reputed companies’ websites like to get a complete package of such tests.

Apart from using the tools mentioned above, a person can do these tests at home. It seems a bit strange to run a test initially. If a person tries to fix the car problems at home using the tools, it will consume more time but save a huge sum of money.

Ultimate Guide To Run A Full Car Diagnostic Test

If a person wants to fix a potential problem in their car (either through professional or by themselves), they will need to follow the below-mentioned process.

1. Problem Indication Phase

  • The first and foremost thing to remember about the indication of the car for an issue is the check engine light. A person can find this light on/off in the dashboard panel. When the light is highlighted, it means a problem has been found in the car. It will not specify in which part of what is the actual problem.
  • After this signal, the AI-based system built in the car will generate expert codes known as ‘Onboard Diagnostic Codes’. These codes are difficult to read, understand, and analyze.

2. OBD Reader & Usage

  • In order to read and understand the codes, the mechanic or an expert will bung the diagnostic code reader into a port. This device will facilitate the problem understanding part of the process. A person has to find the OBD-II port plug-in for this device.
  • This port will be present under the dashboard or around the car’s steering. Experts advise that before plugging in this device, make sure to turn the car off.
  • People need to turn on the device to enable code reading. Some code scanners/readers automatically read the codes as soon as the device’s power is on, while some contain a menu and button of ‘Scan’.
  • After plugging in, these tools will decode the codes and issue(s) the car face. The diagnostic trouble codes need time to be understood, especially if the person is a non-specialist. The system will store the codes. Download them to interpret the code & problem better.

3. Trouble Code Interpretation Phase

  • After extracting the error code, the main task comes into the frame – interpretation & analysis of the code. It is a complex process to identify the actual problem. There are tips to simplify the process.
  • To facilitate the interpretation phase, a person should first try to fetch results from the internet about the provided code. People can generate these details from different automotive and car manufacturers/supplier websites. They can also use third-party system software. These programs can read the problem directly from the PC and convert it into readable information.
  • If a person has an advanced diagnostic tool or modern Bluetooth tools, they can get an added advantage of more efficiency of code reading. These tools can provide more information or direct information than other tools. In this way, you can interpret the car issue.

4. Final Stage Of Fixing The Problem

  • After finding the issue, solve the problem using appropriate tools, devices, and equipment. Despite having great knowledge and decent skills, some people hire a mechanic to fix the issue. If you have basic knowledge about the detected problem, perform the solution stage yourself. However, the mechanics possess more tools to fix the same problem more efficiently and effectively.
  • If a person is performing the fixing part themselves, they must be specialized in error code reading. A simple trouble code often highlights a simple and smaller underlying problem, But, actually, they signal a hidden problem that is likely to be ignored.
  • The other and the most obvious option to fix the issue is to hire a professional mechanic. They can fix all the loose ends of the problem. It will ensure more credibility that a problem is fixed. This is a more expensive option than the DIY option. Nevertheless, the former will always give an edge over the latter.


The points mentioned above give a detailed guide to ‘what is a diagnostic test’ and ‘how a car can be assured from severe problems’. The method does not differ even if the person runs the whole car diagnostic test by themselves.

There are two main things that create a difference between a good and an excellent diagnostic test, i.e., diagnostic code readers and correct identification of the issue. If a person uses sophisticated tools to read OBD codes, they will attain better results in a faster way.

A person needs to analyze every factor in the test to ensure the problem does not frequently arise, even after running the test. Identification of small problems can be an indication of severe problems like fuel injector issues, brakes failure, transmission errors, heating & cooling problems, throttle problems, etc. Therefore, it is crucial to run a full diagnostic car test regularly.