When using an OBD scanner to check vehicle fault codes, you need to make sure the vehicle is running. If the OBD scanner does not operate with the ignition on, it may cause a blank OBD code. Some vehicles have multiple fuses, so if you’re not sure where your fuse box is, read your car’s manual. However, most cars have one fuses box that you can check.
If your car does not have an OBDII connector, you can use a basic scan tool or code reader to determine what the problem is. These tools are designed to be plugged into the diagnostic connector located under the instrument panel near the steering column. Once connected, the tool will read the codes on your vehicle. Some models require that you have the car running. You must also make sure that you have a compatible scan tool. The OBD2 scanner is readily available in the market.
When using a code reader, it is important to understand the difference between live data and scanned data. A live data scan requires the engine to be running, but a scan for DTCs is not live data. Professional mechanics can diagnose problems without the check engine light. There are a few exceptions to this rule, though. If you’re not sure whether your car needs to run to check codes, make sure to visit a mechanic.