OBD2 Codes

How to read and clear fault codes

Every vehicle has an error memory which stores issues or problems that show up in your car. These issues are stored in the form of a code, also known as OBD2 codes. 

OBD2 codes are a series of letter and numbers which indicate the type of issue present in a car and the location of this issue.

Usually, whenever there is a serious problem with your car, you are warned by an indicator light on your dashboard. To understand what exactly the problem is,  you or your mechanic can easily read your vehicle’s memory with an OBD2 scanner and see what OBD2 codes are present.

Afterward, you will know exactly what is occurring in your vehicle and can carry out the necessary repairs and maintenance.


There are about 10,000 different types of OBD2 codes. Every OBD2 code can either be a:

– OBD-level code

– Manufacturer-level code

OBD codes represent issues related to the engine of the vehicle. 

However, manufacturer-level codes represent issues that are related to all other systems of a car, such as the ABS system, air bag, etc.

OBD2 codes

Complete guide for every OBD2 code

Get FREE professional information and repair guides for your OBD2 codes

How to read out understand clear out OBD2 codes in your car

Whether you are a car beginner or expert, running a car diagnostics check is extremely easy and insightful. All you need is the right equipment which consists of two simple things.

OBD2 Scanner

An OBD2 scanner (also know as an adapter) is a small device that can be connected into your vehicle’s OBD2 port. This device will detect all of your car’s components and data.

Car Diagnostic App

With the app, you can access every system and data that was collected by the OBD2 scanner. Additionally, you will also be able to control and customize your car through the mobile app.

3 easy steps to read and clear out OBD2 codes

apps to read OBD2 codes

Running a health check means that the scanner will take a look at all of your car’s ECUs and make a list of any issues found in your car.

These issues will be shown in the form of OBD2 codes which indicate the type of issue present and the location of the issue.

The Carly app will provide you information about any OBD2 codes present.

Once the car diagnostics check is completed, the scanner will have read out all the OBD2 codes present in your car.

We recommend you go through all of the codes found to see if there are any critical problems that you need to take care of.

In order to help with this, the Carly app will categorize your car’s OBD2 fault codes depending on their severity.

fautl codes

There are two scenarios when you should clear your car’s OBD2 fault codes:

1. After running your first diagnostics check: It is possible that old codes are stored in your vehicle’s memory but are no longer an issue, so it’s best to clear them and see if they come back after a few days of driving.


2. After fixing issues in your car: You should clear all fault codes after repairing issues in your car and run another diagnostics check to ensure they are not present anymore.

Most vehicles manufactured after 2001 should have an OBD2 interface. This interface can be accessed with an OBD2 scanner in order to see all of your car’s data.

Yes! It’s is completely safe to leave your OBD2 scanner plugged into your car’s OBD2 port.