What is the check emission system light on a Subaru?
The check engine light, also known as the malfunction indicator light (MIL), is a warning system in Subaru vehicles that alerts the driver to potential issues with the engine or emissions control system. When this light illuminates on the dashboard, it's important to address the underlying problem promptly to avoid further damage or decreased fuel efficiency.
What Does the Check Engine Light Indicate?
The check engine light on a Subaru can be triggered by a variety of issues, including:
- Malfunctioning sensors or components in the engine or emissions control system
- Problems with the fuel system, such as a faulty fuel pump or clogged fuel injectors
- Ignition system issues, such as faulty spark plugs or ignition coils
- Problems with the catalytic converter or other exhaust components
- Loose or damaged gas cap
When the check engine light illuminates, it's important to have the vehicle diagnosed by a qualified mechanic or technician to determine the underlying cause and address the problem.
Diagnosing and Addressing the Check Engine Light
To diagnose the check engine light, a mechanic will typically use an on-board diagnostic (OBD) scanner to read the trouble codes stored in the vehicle's computer. These codes provide information about the specific problem that triggered the light, allowing the mechanic to identify and address the issue. Some common steps in the diagnosis and repair process include:
- Connecting the OBD scanner to the vehicle's diagnostic port to read the trouble codes
- Visually inspecting the engine and emissions control components for any obvious signs of damage or wear
- Performing additional tests, such as checking for vacuum leaks or testing the fuel system
- Replacing any faulty components or making necessary adjustments to resolve the underlying problem
- Clearing the trouble codes and verifying that the check engine light has turned off
It's important to address the check engine light promptly, as ignoring the problem can lead to further damage and decreased fuel efficiency. By working with a qualified mechanic and addressing the underlying issue, Subaru owners can ensure their vehicle's performance and emissions control system are functioning properly.
Can I still drive my car if it says check emission system?
Can I still drive my car with the “Check Emission System” warning light on? It's not recommended to drive with the Check Emission System warning light on until you know the cause. Long-lasting damage and extensive repairs can result.
Why would the check emissions light come on?
Some common issues that trigger the warning light include a loose gas cap, a clogged air filter, a bad catalytic converter, a failing oxygen sensor, and other faulty engine sensors. You can still drive with an illuminated check emission light, but it's not recommended as it could lead to engine damage.
What is the most serious Subaru warning light?
What is the most serious warning light? Of all Subaru dashboard symbols and meanings, the Oil Pressure Warning Light, Brake System Warning Light, and Battery Warning Light are possible causes for concern. Still, the Check Engine Warning Light is one of the most urgent symbols.
How do I fix my check emission system?
To fix a "check emission system" light, first check the simplest things like a loose or damaged fuel cap. If that doesn't work, use a diagnostic tool to find the specific trouble code, then address the underlying issue, which could be a faulty sensor, a clogged catalytic converter, or other component problems. After the repair, clear the code using the tool or by disconnecting the battery, though professional diagnosis is best for complex issues.
1. Check the simple things first
- Fuel Cap: Make sure your fuel cap is on tight. If it's cracked or damaged, replace it. The light may go off after a few drive cycles.
- Quality Fuel: Using low-quality fuel can cause issues. Try filling up with higher-quality gas and adding a fuel system cleaner.
2. Use a diagnostic tool
- Scan for codes: A diagnostic tool (OBD-II scanner) can read specific trouble codes that pinpoint the problem, such as a faulty oxygen sensor or a clogged catalytic converter.
- Clear the codes: After identifying and fixing the problem, use the scanner to clear the code. If the light stays off, the issue is resolved. If it comes back on, there may be a more complex problem.
3. Address common component issues
- Faulty oxygen sensor: These sensors can wear out. You can replace one by unplugging its cable and unscrewing the old one before installing the new one.
- Clogged catalytic converter: For minor blockages, a catalytic converter cleaner can help flush the system.
- Dirty MAP sensor: A Mass Air Flow (MAF) sensor can get dirty. Cleaning it with a specific MAF cleaner may fix the problem.
- Dirty air filter: A clogged air filter can affect the system. Remove, clean, or replace the filter to improve airflow.
4. Reset the light
- Disconnect the battery: For a quick reset, disconnect the negative terminal of your battery for about 30 seconds. This clears the computer's memory, but the light will return if the underlying problem isn't fixed.
5. When to see a professional
- Seek professional help: If you can't identify the problem or the warning light comes back on, it's best to take your vehicle to a professional. Complex systems require specialized tools and expertise.
- Avoid ignoring the warning: Driving with the light on is not recommended, as it could indicate a problem that could cause further damage to your engine or emission components.
