OBD II Diagnostic Trouble Code Search

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OBD II Code Lookup

OBD II Codes List

Accurate and reliable information about OBD II diagnostic trouble codes that can help you identify and troubleshoot problems with your vehicle.

With our free to use OBD II code lookup services you can find out what exactly is wrong with your vehicle and pinpoint what you or your mechanic needs to repair.

On our website we offer a comprehensive list of OBD II codes and their meanings, along with tips and techniques for fixing these codes.

What is a OBD II Code?

OBD II (On-Board Diagnostics II) is a standardized system that monitors and reports the performance of a vehicle's engine, transmission, and emissions systems. When a problem is detected, the system generates a code that corresponds to the issue. These codes are displayed on a car's dashboard, and can be read using an OBD II scanner.

There are two types of OBD II codes: generic and manufacturer-specific. Generic codes are common across all makes and models, while manufacturer-specific codes are unique to each brand. Both types of codes consist of five characters, with the first character indicating the system affected by the issue.

Before you start any repairs, it's important to understand the meaning of the OBD II code you're dealing with. For example, the code P0301 indicates a misfire in cylinder 1, while the code P0420 indicates a problem with the catalytic converter. By using our free OBD II code lookup service, car owners can get a understanding of the underlying issues affecting a vehicle.

You can use an OBD II scanner to read the code and get a basic understanding of what’s going on. Once you have the code, you can look it up on our websiteor consult your vehicle’s owner’s manual to get more information on the issue. Our free to use OBD II code lookup will assist you in finding out what is wrong with your vehicle.

Common OBD II Codes


Catalyst System Efficiency Below Threshold: This code is usually triggered when the catalytic converter in your vehicle is not working properly. It can be caused by a number of factors, including a faulty oxygen sensor or a malfunctioning catalytic converter.


Random/Multiple Cylinder Misfire Detected: This code is typically caused by a misfiring engine cylinder, which can be the result of a variety of issues, including faulty spark plugs, a malfunctioning ignition coil, or a vacuum leak.


System Too Lean: This code indicates that the fuel-to-air ratio in your engine is off, usually because there is too much air or not enough fuel. This can be caused by a variety of factors, including a vacuum leak, a faulty fuel injector, or a clogged fuel filter.


Evaporative Emission Control System Leak Detected (Small Leak): This code is usually triggered when there is a leak in the evaporative emission control system, which is responsible for controlling the release of fuel vapors into the atmosphere.

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