Code OBD

On our resource, we provide information about the OBD-II system and related errors. Here you will find the full version of the fault codes, as well as decoding of OBD-2 errors . Simplify the process of analysing errors and performing diagnostics on your car using our OBD-2 codes. Find out how this system helps cars monitor their condition and identify potential malfunctions, enabling more efficient maintenance and repairs.

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OBD-2 decoding

To understand your vehicle's diagnostics on your own, you can explore information about the structure and meaning of OBD-2 error codes. The indexing of OBD-2 fault codes is divided into two main categories:

Basic OBD-2 codes (or universal, generic OBD-2 codes)

Basic OBD-2 codes generally have similar characteristics for all OBD-2 compliant vehicles. These errors are usually caused by typical defects specific to each model. Unlike the universal codes, the extended OBD-2 codes provide a detailed breakdown and can be individualised for each vehicle brand. The structure of the basic and extended OBD-2 codes is generally similar, consisting of a Latin letter and a sequence of four digits (in some cases, letters).

Extended OBD-2 codes (or additional, extended OBD-II codes)

It is recommended to decode OBD-2 errors as follows:

First part of the OBD-2 error code:

P – vehicle engine and/or automatic transmission;

B – "body systems" (power windows, airbags, central locking);

C – chassis (running gear);

U – interaction between electronic units.

The second part of the OBD-2 error code:

0 – is the common index for all ELM327 Bluetooth codes;

1 and 2 – manufacturer's code;

3 – reserve.

The third part of the error code is the type of fault:

1 – air supply or fuel system;

2 – air supply or fuel system;

3 – ignition system;

4 – auxiliary control;

5 – idling;

6 – circuits of the electronic control unit (ECU) or the ECU system in general;

7 – power transmission;

8 – power transmission.

The fourth and fifth parts of the code indicate the sequential OBD-2 error number.

Quickly resolve problems with error codes

In our section you will find a simple and effective way to solve your car's problems. Use the handy OBD2 error code search to quickly identify faults and get detailed information instantly. In addition, you can view common OBD2 error codes.

Also, our [brand catalogue] provides specific fault codes for your make and model, which allows for more efficient diagnostics and repairs. Get to the bottom of your car's problems by relying on our car error codes section and ensure reliable service for your vehicle with AvtoPro.

The following error codes are often searched for

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Our authors and experts

On our website you can read informative articles that have been prepared by experts in the field of vehicle diagnostics and maintenance.

Lisa Morgan

Hi, I’m Lisa. I know how confusing a blinking dashboard light can be — I’ve helped hundreds of drivers figure it out. I keep my explanations practical and clear, just like I’d explain them to a friend or a customer in the garage. No jargon, just real experience.

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Oleh Stepanchuk

Hi! I don’t just replace bulbs or batteries — I dig into wires, modules, and circuit diagrams when other technicians have already given up and told you to "just get a new car." If there’s a gremlin hiding in your wiring — I’ll find it.

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Ihor Koziar

I always say: the scanner shows a code, not the problem. My job is to find the root cause — not just clear the error from the dashboard. If something is lagging, acting weird, or just not like it used to be — I’ll figure it out.

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Irina Semenova

I know how frustrating it is when you need just one part, but there are five options — and you have to guess which one is right. My job is not to guess, but to get it exactly right. I don’t just look up numbers — I understand how the part works, what it connects to, and what happens if you get it wrong.

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