On-Board Diagnostics

Using the On-Board Diagnostics 2 in Your Car
OBD refers to a car’s self diagnostic and reporting capability. OBD systems give mechanics access to various subsystems of a vehicle. But, it can also be used by car owners to find out about what’s going on under the hood. So, without any further ado, here are a few things car owners need to know about the OBD-II in the vehicle.

The Check Engine Light

It’s safe to say that almost every new car some along with the on board diagnostics 2 system, which is actually a fault registering system that is connected to sensors all over the vehicle and give real time feedback on how different functions such as the engine, emission and fuel systems are working. But, this can also cause confusion for the driver since the sensors are connected to so many parts.
First off, the codes that are stored in OBD II are split into two categories, active and inactive or historical. The historical codes are lists of things which have been detected in the car in the past, but are no longer an issue. On the other hand, the active codes are those which are a problem and have to be dealt with right now. These codes are also sub-divided into B-codes relating to the body of the car, and C-codes which are of the chassis. But, the longest list of codes is for the powertrain and is listed under P-codes.

The P0440

This is by far the most common code you will have to deal with, and is usually the first thing you should be checking for while using the OBD-II. P0440 stands for Evaporative Emission Control System Malfunction which actually covers a multitude of sins. The first of those is the petrol cap. While most new cars have a pressurized fuel system along with a vapor recovery loop it is still important that you make sure the petrol cap is twisted until it clicks, otherwise it will not pressurize and the OBD II will log the warning code. But, if it wasn't the gas cap, and tightening it didn't do the trick then you will need to take your car to the garage.

There are various tools are available that plug into the OBD connector to access OBD functions. These range from simple generic consumer level tools to highly sophisticated OEM dealership tools and vehicle telematic devices.

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