The check engine light can illuminate for a multitude of reasons. However some of these reasons may not necessitate an immediate trip to the auto repair center. If you’re inclined to address the illuminated light yourself, you could use an OBD2 scanner to determine the culprit behind the issue. These scanners can read and erase fault codes, and they’re relatively easy to use. Modern vehicles feature OBDII ports, which means that this task is possible with a code scanner. Here’s how to clear a check engine light with a scanner.
First, plug the OBD2 scanner into the port underneath your dashboard. Turn the key to the “on” position, but don’t start the engine. Next, turn on the scanner and follow the prompts on the screen. The scanner will read the fault codes from your vehicle’s computer. Once the codes have been read, you can clear them by pressing the “clear” button on the scanner. However, if the underlying issue persists, the check engine light will likely come back on. As such, it’s important to have your vehicle inspected by a mechanic if the check engine light reappears.
OBDII scanners are available for purchase online or at auto parts stores. They range in price from $20 to $200, depending on the features and capabilities. If you’re not comfortable using an OBDII scanner, you can take your vehicle to an auto repair shop and have them clear the check engine light for you. However, this service will likely cost more than purchasing and using your own scanner.
Viewing Live Data
Live data streaming is a crucial feature of OBD2 scanners, allowing you to monitor real-time information while your vehicle is running. This data provides valuable insights into your engine’s performance and can help pinpoint issues that may not be readily apparent during a standard inspection. Accessing live data through an OBD2 scanner is a straightforward process:
- Connect the scanner to your vehicle’s OBD2 port.
- Turn on the scanner and ensure it is communicating with the vehicle.
- Navigate to the “Live Data” or “Data Stream” option on the scanner’s menu.
- Select the desired data parameters to monitor. This may include engine speed, coolant temperature, fuel trim, and many others. Depending on the scanner’s capabilities, you can typically view multiple parameters simultaneously.
- Start the engine and observe the live data stream.
- Analyze the data to identify any anomalies or fluctuations outside the expected ranges.
| Parameter | Typical Range |
|---|---|
| Engine Speed (RPM) | 600-900 at idle, varies with load |
| Coolant Temperature | 195-220°F (90-105°C) |
| Fuel Trim | -10% to +10% |
| O2 Sensor Voltage | 0.1-0.9V (varies based on sensor type) |
By comparing the live data to known specifications or manufacturer recommendations, you can identify potential issues. This information can guide further diagnostics and help you make informed decisions about any necessary repairs or maintenance.
How to Clear the Check Engine Light With a Scanner
The check engine light is a warning indicator that illuminates on a vehicle’s dashboard to indicate a potential problem with the engine or emissions system. To clear the check engine light using a scanner, follow these steps:
- Connect the scanner to the vehicle’s diagnostic port, typically located under the dashboard.
- Turn on the ignition but do not start the engine.
- Navigate the scanner’s menu to access the “Diagnostic Functions” section.
- Select the “Clear Codes” option.
- Confirm the operation and wait for the scanner to complete the process.
Once the codes have been cleared, start the engine and check if the check engine light remains off. If the light reappears, it suggests a persistent issue that requires further diagnosis and repair.
People Also Ask About How to Clear Check Engine Light With Scanner
What is a diagnostic trouble code (DTC)?
A diagnostic trouble code (DTC) is a code stored in the vehicle’s computer that provides specific information about a detected issue or malfunction.
Can I clear the check engine light by disconnecting the battery?
While disconnecting the battery may temporarily clear the check engine light, it does not resolve the underlying issue. The light will reilluminate once the battery is reconnected.
Is it safe to drive with the check engine light on?
In most cases, it is not advisable to drive with the check engine light on as it may indicate a serious issue that could affect the vehicle’s performance or safety.
