Are All OBD Ports The Same? OBD II Ports - Differences and Locations

Owners and mechanics can access data from the vehicle's onboard computer using a standardized interface called an OBD connector (On-Board Diagnostics). This system monitors pollutants, assists in diagnosing engine problems, and guarantees vehicle safety and reliability on a road.  Numerous characteristics are regularly monitored by the on-board system, which offers vital information about the vehicle's operation.

Difference between OBD and OBD2

OBD II ports are not a novelty for modern drivers, but they still have many questions about it. The difference between OBD and OBD2 lies in their technological advancements and compatibility. Introduced in the 1980s, OBD was the first version of onboard diagnostics. With the development of the automotive industry between 80 and 90, two issues arose. No uniformity of port standardization for connection to the automotive system. This is, to some extent, hampered the diagnostics process.  The second issue was caused by the awareness of the environment problems.

By offering a worldwide standard, OBD2, which was first presented in 1996, overcame these concerns. The creation of a common for all cars diagnostic port OBD II was associated with the deterioration of the environmental situation. In this case, requirements for the technical inspection became stricter: it was mandatory to check the status of the ECU (electronic control unit) of the car. Moreover, this technology enables more thorough diagnostics and makes use of a 16-pin connector. OBD2 ensures compatibility across all brands and models by applying to all vehicles manufactured after 1996, in contrast to OBD1, which was manufacturer-specific.

Types and their differences

 There are primarily two types of OBD port types:

• OBD1 ports: These were specific to each manufacturer and needed certain diagnostic instruments and connectors. Their lack of standardization made them less effective.

• OBD2 ports: These are universal for all vehicles manufactured after 1996, allowing standardized access to diagnostic data.

In terms of connector form and functioning, the typical response to whether all OBD2 ports are the same is yes. Nonetheless, different manufacturers employ different communication protocols. The majority of contemporary automobiles employ protocols like CAN (Controller Area Network), which offer enhanced diagnostics and quicker data transfer.

Why you should use of OBD2 systems

OBD II specification provides a standardized hardware interface and is a diagnostic socket connector, with 16 contacts for connecting diagnostic equipment to the vehicle (each of the contacts is responsible for a separate part or system of the car).

• Improved diagnostics

OBD2 allows real-time monitoring of vehicle performance and emissions, helping detect potential issues early.

• Standardization

Unlike OBD1, OBD2 is universally accepted, making it easier to use across different vehicles.

• Enhanced vehicle safety

The system continuously monitors essential parameters, reducing the risk of breakdowns and accidents.

• Cost savings

Early detection of faults helps prevent expensive repairs.

Which OBD System is installed in my car?

To determine whether your vehicle has OBD1 or OBD2, check the manufacturing year. If your car was built before 1996, it likely has OBD1, while vehicles produced after 1996 come equipped with OBD2. The OBD2 port is usually located under the dashboard, near the driver’s seat.

How to use an OBD2 scanner?

There are many types of OBD2 scanners. Some of them are universal, others are more professional and work only with special software. Since InCarDoc is a mobile application for OBD2 diagnostics, drivers need to use a quality wireless ELM327 adapter. To continue, let's find out what is an OBD port? It refers to the 16-pin diagnostic connector in a vehicle that enables communication between the ECU and an external diagnostic tool via adapter (in this case inCarDoc app).

1. Locate the OBD2 port in your car (usually under the dashboard or steering column).

2. Plug the OBD2 ELM327 adapter into the port.

3. Connect the diagnostic app to the adapter via Bluetooth or Wi-Fi.*

4. Turn on the vehicle’s ignition without starting the engine.

5. Use the scanner to read diagnostic trouble codes (DTCs).

6. Analyse the results to identify potential issues.

*Note that the connection rules, depending on the types of programs and the operating system of the device on which the program is installed, may differ. To learn how to connect and use inCarDoc, we suggest watching the video, or reading the User Guide. Using InCarDoc application from PNN Soft, you can conduct a car diagnostic examination by yourself. All you need is InCarDoc app on your smartphone and OBD II diagnostic adapter.