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The OBD-II PIDs have the main function to keep track of and reporting on different vehicle and engine parameters. This includes things like the engine speed, the fuel trim, and the term perature of the coolant. and so forth  The collected data could be utilized to figure out what’s wrong with an engine or vehicle, like if a sensor isn’t working or the engine isn’t firing right. Also, the real-time data that OBD-II PIDs give can help drivers keep an eye on their car’s performance and gas mileage.

Types of OBD-II PIDs


There are three major types of OBD-II PIDs used in the automotive industry, including Standard OBD-II PIDs, Manufacturer-Specific OBD-II PIDs, and Enhanced OBD-II PIDs.

  • Standard PIDs: These PIDs are required by law to be supported by all automobiles that are OBD-II compliant. These PIDs include fundamental information regarding the automobile’s engine as well as the automobile itself.
  • Manufacturer-Specific PIDs: These PIDs are exclusive to a certain vehicle manufacturer. These PIDs offer additional data that is exclusive to the vehicles produced by that manufacturer.
  • Enhanced PIDs: The use of enhanced PIDs or commonly known as extended PIDs is basically voluntary and has the potential to supply more data in addition to that which is mandated by the legislation. 

OBD-II PID System Components

OBD-II PID System Components OBD-II PIDs


  • The OBD-II PID system consists of three primary components: the Engine Control Module (ECM), the OBD-II Connector, and the OBD-II Scan Tool. These components work as an integral system. 
  •  The Electronic Control Module (ECM): This is the component of the vehicle that is accountable for managing the engine and gathering data from a variety of sensors located all over the vehicle.
  • The OBD-II Connector: Under the dashboard, there is a connection that has been standardized as an OBD-II Connector. This port enables the OBD-II Scan Tool to interface with the engine control module (ECM).
  • The OBD-II Scan Tool: Mechanics make use of the OBD-II Scan Tool to read and understand the data that is acquired by the OBD-II PIDs.

OBD-II PID Parameters

There are over 300 standard OBD-II PIDs that are supported by all OBD-II compliant vehicles. Some of the most common OBD-II PID parameters include engine speed, coolant temperature, fuel trim, and oxygen sensor voltage. Manufacturer-specific PIDs may also be available for certain vehicles and provide additional data specific to that manufacturer’s vehicles. 

OBD-II PID Data Interpretation

Interpreting OBD-II PID data can be an On-Board Diagnostic II Parameter IDs or OBD-II PIDs are a key part of the OBD-II system that helps monitor and report different engine and vehicle parameters. OBD-II PIDs give drivers and mechanics real-time information that helps them figure out what’s wrong with the engine or vehicle. let’s learn further about how OBD-II PIDs work and why they’re important in the OBD-II system.

a complex process that requires some knowledge of the vehicle’s systems and sensors. One way to interpret OBD-II PID data is to use an OBD-II Scan Tool, which can read and interpret the data collected by the ECM. The data collected by OBD-II PIDs can be used to diagnose engine and vehicle issues, such as a malfunctioning sensor or a misfire in the engine.

OBD-II PID Diagnostic Trouble Codes (DTCs)

Diagnostic Trouble Codes (DTCs) are codes generated by the OBD-II system that indicate a problem with the engine or vehicle. Common DTCs related to OBD-II PIDs include codes for malfunctioning oxygen sensors or engine misfires. There is a long list of DTCs related to PIDs, these are some examples:

  • P0332 – Fuel system status
  • P0661 – Short-term fuel trim—Bank 1
  • P0A101 – Fuel pressure (gauge pressure)
  • P1A262Oxygen Sensor 7(A: Voltage; B: Short-term fuel trim)

To diagnose and fix OBD-II PID DTCs, mechanics will use an OBD-II Scan Tool to read the codes and determine the cause of the problem.

Importance of Maintaining OBD-II PIDs

Now that we know what the OBD-II PID system is and how it works, it’s important to talk about how important it is to keep it in good shape. When the OBD-II PID system is kept in good shape, drivers and mechanics can quickly and accurately figure out what’s wrong with their cars. This saves time and money over the years. 

Benefits of maintaining the OBD-II PID system

By taking care of the OBD-II PID system, you can get real-time information about how your car is running. This lets you make accurate decisions regarding how to drive and take care of your car. This information can help you figure out what’s wrong with your car before it gets worse and costs more to fix. Also, keeping the OBD-II PID system in good shape can improve fuel economy and lower emissions, making your car better for the environment.

Consequences of ignoring OBD-II PID system maintenance

If you don’t take care of the OBD-II PID system, you might have to pay for expensive repairs in the future. If the system isn’t working right, drivers and mechanics could miss important warnings about how the car is running, which can lead to bigger problems that cost more to fix. If you don’t take care of the OBD-II PID system, it can also lead to more emissions, which wastes fuel and hurts the environment.

Maintaining the OBD-II PID system regularly is important for keeping your car running well and finding problems before they get worse. It’s important to follow the maintenance schedule suggested by the manufacturer and have a qualified mechanic check your car regularly.


OBD-II PIDs let car owners or mechanics keep an eye on engine and vehicle parameters and figure out what’s wrong. The ECM, the OBD-II connector, and the scan tool are all parts of the system. PIDs can be standard, specific to a manufacturer, or enhanced or extended. By reading OBD-II PID data, drivers and mechanics can quickly find and fix problems with a car. For the OBD-II PID system to work well and give accurate data, it must be well-maintained. Neglecting the OBD-II PID system can cost money and hurt the environment. Maintaining the OBD-II PID system is important for the performance of the car and for finding problems early.