Citroen C4 DS4 OBD diagnostic port location 2011 - 2020

OBD port location on a Citroen C4 and DS4 from 2011 to 2020.
OBD stand for "on board diagnostic" and it have different names, OBD, OBD2, EOBD, EOBD2, it is a computer system inside of a vehicle that tracks and regulates a car’s performance. This on-board computer system collects information from the network of sensors inside the vehicle, which the system can then use to regulate car systems or alert the user to problems. A technician can then simply plug into the OBD system to collect vehicle data and diagnose the problem. OBD systems have been a great help in helping users better understand vehicle diagnostics.
The history of OBD begins in the 1980s. During this time, vehicle monitoring systems were developed in response to several factors, including:
- Emissions control: One of the biggest reasons for developing OBD was to help reduce vehicle emissions. OBD systems help in this area by monitoring the performance of major engine components for any system failures that could result in increased emissions. OBD is so helpful in this area that it is incorporated into EPA literature on the implementation of the Clean Air Act.
- Electronic fuel injection: In the 1980s, automakers began the widespread production of vehicles with electronic fuel injection. Unlike mechanical fuel injection systems, electronic fuel injection works via computer control, with the computer system monitoring and determining the fuel flow into the engine.
- Electronic components: As electronic fuel injection gained popularity, more electronics became commonplace in cars, increasing the need for more sophisticated monitoring systems to help identify problems more accurately.
Since its initial development, vehicle monitoring systems have undergone several iterations. Today, OBD serves as a standardized system that dictates the connectors and trouble codes used, making it easy for technicians to service a wide range of vehicles quickly and accurately.
A basic OBD system consists of a central system, a network of sensors, a connection point and indicators, creating a complete monitoring system with standardized access and readability. The OBD system consists of the following components:
ECU:The central part of the OBD system is the Electronic Control Unit, or ECU. The ECU collects input from various sensors throughout the vehicle. The ECU then uses this data to either control parts of the vehicle, like fuel injectors, or monitor for issues.
Sensors:There are sensors throughout vehicles covering every area from the engine and chassis to the electronic system itself. Each one of these systems sends codes to the ECU, specifying the source and the parameters of the signal. The ECU then “reads” and interprets this signal.
DTC:If a sensor sends information to the ECU that falls outside of the normal range, the ECU saves the information as a code called a Diagnostic Trouble Code, or DTC. The DTC code essentially is a list of letters and numbers, which indicate the source and nature of the problem. DTC codes are usually standardized but may be manufacturer-specific. When a DTC is saved, the ECU sends a signal to your indicator light to state that a problem has been found. The DTC can also be pulled by linking a sensor to the connector for the OBD system.
MIL:When the ECU collects a DTC code, it sends a signal to the vehicle dashboard to turn on the appropriate indicator lights. These lights, known formally as Malfunction Indicator Lights or MILs, provide an early warning system for vehicle malfunctions. Generally speaking, if the light turns on and stays on, the problem is minor. If the light flashes, the problem is urgent.
DLC:
All of the data and DTC codes collected by the ECU can be accessed via the Diagnostic Link Connector or DLC. The DLC port is the point of access for vehicles with OBD systems and is often found beneath the dashboard on the driver’s side of the vehicle, though it may be located elsewhere in commercial vehicles. Current vehicles are made with a standard OBDII system so that any scan tool with a type 2 cable can connect to the type 2 connector.

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