What can be connected to the OBD interface?
3 Answers
The OBD interface itself cannot be externally connected, and external products may affect the car itself through the OBD interface due to their own malfunctions or issues. OBD is a detection system extended for automotive fault diagnosis. The location of the OBD interface can be in two situations: one is next to the blower above the accelerator pedal, and the other is under the dashboard on the right side of the passenger seat. The position varies by car model and is very hidden, requiring a flashlight to locate. Below is an introduction to the functions of the car's OBD interface: 1. Display of vehicle computer data: The OBD interface can provide various operational data of the vehicle. 2. Reading fault codes: The OBD interface can be used to read fault codes. 3. Changing codes to achieve more functions: It can enable many different 'hidden' functions to achieve 'additional configurations'. 4. Reading and flashing ECU-TCU programs: It allows manufacturers to update the ECU control program at any time.
From a car enthusiast's perspective, the OBD port is truly a treasure trove! What I plug in most often is the fault diagnostic tool—when the check engine light comes on, just plug it in to read the specific trouble codes. Next is the onboard computer display, which shows real-time data like RPM and coolant temperature. Tuners love connecting aftermarket ECUs to adjust engine parameters, but be careful as it might void the factory warranty. Recently, I also installed a GPS-enabled anti-theft tracker, allowing me to locate my car in real-time via my phone. A heads-up display is super practical too, projecting speed directly onto the windshield. A word of advice: always check device compatibility with your car model and avoid no-name products. A friend once messed up his CAN bus by using a random device and ended up paying over 800 yuan for repairs!
As an average car owner, I mainly use the OBD port for two types of devices: I bought a simple diagnostic tool for about a hundred bucks, which allows me to check fault codes myself. Last time when the engine light came on, I found out it was an oxygen sensor issue, saving the inspection fee at the 4S shop. The other device I often plug in is a fuel consumption display, which shows real-time fuel usage while driving, helping me gradually break the habit of stomping on the accelerator. I've heard that insurance companies can install driving record devices for premium discounts, but I haven't tried it due to privacy concerns. A reminder: it's best to cut power when parking with devices plugged in. Once I forgot to unplug a GPS device during a two-week business trip, and the battery was completely drained when I returned, leaving the car unable to start.
