How to Use a Car Key Decoder?

[MaciRose]

1. Before testing, correctly select the detection adapter connector. Since the power supply forms provided by inspection connectors vary across vehicle models—some requiring external power and others not—it is essential to avoid damaging the device by selecting an inappropriate connector. 2. The device's rated voltage is 12V. During testing, the battery voltage should be between 11~14V. 3. Turn off all auxiliary electrical equipment in the car (e.g., air conditioning, headlights, audio system, etc.). 4. Power on the device, and the screen will flash. If the program does not run or displays garbled code, unplug the data cable and reconnect it once to resume operation. 5. Ensure the test connector and diagnostic socket have good contact to guarantee uninterrupted signal transmission. 6. Read and clear fault codes. Some decoders provide detailed explanations of fault codes, such as whether they are historical or current fault codes and how many times the fault codes have appeared. 7. After testing, first power off the device, then disconnect the data cable and test card from the main unit.