The dreaded check engine light. Its sudden appearance on your 2013 Toyota Corolla’s dashboard can induce anxiety and uncertainty. What’s wrong? Is it serious? Can I still drive? While it’s crucial to address the underlying issue triggering the light, sometimes you might need to reset it after making repairs or simply to see if the code reappears. This comprehensive guide provides you with several safe and effective methods to reset the check engine light on your 2013 Corolla.
Understanding the Check Engine Light
Before diving into the reset methods, it’s important to understand what the check engine light signifies. It’s a signal from your Corolla’s onboard diagnostic system (OBD II) indicating that something is amiss within the engine, emissions system, or related components. The light illuminates when the system detects a fault or an abnormal reading from one of its sensors.
Ignoring the check engine light can lead to more significant problems down the road. While it might be a minor issue like a loose gas cap, it could also indicate a serious problem such as a faulty catalytic converter or a malfunctioning oxygen sensor. Therefore, professional diagnosis is highly recommended, especially if the light is flashing or accompanied by noticeable performance issues.
Methods to Reset the Check Engine Light
Several approaches can be used to reset the check engine light on your 2013 Toyota Corolla. These methods range from simple DIY techniques to using specialized diagnostic tools.
Using an OBD II Scanner
The most reliable and recommended method for resetting the check engine light is using an OBD II scanner. These scanners are readily available online and at auto parts stores. They allow you to read the diagnostic trouble codes (DTCs) that triggered the light and, crucially, to clear those codes, effectively resetting the system.
Acquiring an OBD II Scanner
OBD II scanners vary in price and features. Basic scanners typically read and clear codes, while more advanced models offer features like live data streaming, freeze frame data, and component testing. For simply resetting the check engine light, a basic scanner will suffice.
When purchasing a scanner, ensure it is compatible with your 2013 Toyota Corolla. Most modern scanners are universally compatible with vehicles manufactured after 1996.
Connecting the Scanner
The OBD II port in your 2013 Corolla is typically located under the dashboard on the driver’s side. It’s a 16-pin connector.
- Turn off the ignition.
- Locate the OBD II port.
- Plug the scanner into the port.
- Turn the ignition to the “ON” position (do not start the engine).
Reading the Diagnostic Trouble Codes (DTCs)
Once the scanner is connected and powered on, follow the scanner’s instructions to read the diagnostic trouble codes. The scanner will display a code (e.g., P0171) along with a brief description of the problem.
It’s crucial to record these codes before clearing them. This information can be valuable for diagnosing the underlying issue if the light reappears.
Clearing the Codes
After recording the codes, use the scanner’s menu to select the “Clear Codes” or “Reset” option. The scanner will then clear the stored codes, and the check engine light should turn off.
Start the engine and monitor the dashboard to ensure the light remains off. If the problem persists, the light will likely reappear after a short period of driving.
Disconnecting the Battery
Another method, although less precise and potentially less effective, is to disconnect the car’s battery. This method essentially resets the car’s computer, which can clear the stored codes and turn off the check engine light.
Warning: Disconnecting the battery can also reset other electronic systems in your car, such as the radio presets and security system. You may need to re-enter codes or reprogram these systems after reconnecting the battery.
Preparing to Disconnect the Battery
Before disconnecting the battery, ensure you have any necessary codes for your radio or other electronic systems. Also, ensure the vehicle is parked in a safe location and the ignition is turned off.
Disconnecting the Negative Terminal
- Locate the battery in your 2013 Corolla. It’s typically under the hood.
- Loosen the nut on the negative (-) terminal of the battery cable.
- Carefully disconnect the negative cable from the terminal.
- Secure the cable away from the terminal to prevent accidental contact.
Waiting and Reconnecting
Leave the negative cable disconnected for at least 15-30 minutes. This allows the car’s computer to fully discharge and reset.
After the waiting period, reconnect the negative cable to the battery terminal and tighten the nut.
Starting the Car and Monitoring
Start the engine and check if the check engine light has turned off. As with the scanner method, if the underlying issue persists, the light will reappear.
Driving Cycle Method
This method involves performing a specific series of driving maneuvers that allow the car’s computer to re-evaluate the systems that triggered the check engine light. If the system passes these self-tests, the light will turn off automatically.
Note: The driving cycle can be complex and may vary slightly depending on the specific code that triggered the light. This method is not always reliable and may require multiple attempts.
Understanding the Driving Cycle
The general driving cycle involves a combination of highway driving, city driving, and idling. The specific steps are designed to test different components of the engine and emissions system.
Performing the Driving Cycle
Consult your 2013 Toyota Corolla’s owner’s manual or a reliable online resource for the specific driving cycle instructions for your vehicle. Generally, it involves the following:
- Start the engine and allow it to idle for a specified period.
- Drive at a steady speed on the highway for a certain distance.
- Perform several accelerations and decelerations.
- Drive at a moderate speed in city traffic.
Monitoring the Check Engine Light
After completing the driving cycle, monitor the check engine light. If the system has passed all the self-tests, the light should turn off. If not, you may need to repeat the driving cycle or consider other methods.
Important Considerations
While resetting the check engine light can temporarily turn it off, it’s crucial to address the underlying cause of the problem. Ignoring the light can lead to more significant and costly repairs in the future.
Reading and Understanding the Codes
Before resetting the light, always read and record the diagnostic trouble codes. These codes provide valuable information about the nature of the problem. Use online resources or consult a mechanic to understand the meaning of each code.
Addressing the Underlying Issue
Once you have identified the codes, take steps to address the underlying issues. This may involve replacing a faulty sensor, repairing a leak, or performing other maintenance tasks.
Seeking Professional Assistance
If you are unsure about the cause of the check engine light or how to repair it, it’s best to seek professional assistance from a qualified mechanic. They have the expertise and equipment to diagnose and repair complex automotive problems.
When Not to Reset the Light
It’s generally not advisable to reset the check engine light if:
- The light is flashing. A flashing light usually indicates a serious problem that requires immediate attention.
- The car is experiencing significant performance issues. If the car is running poorly or making unusual noises, resetting the light will not fix the underlying problem.
- You are planning to have the car inspected soon. Resetting the light before an inspection can prevent the car from passing, as the inspection system will detect that the codes have been recently cleared.
Post-Reset Monitoring
After resetting the check engine light, carefully monitor your 2013 Toyota Corolla for any signs of trouble. If the light reappears, it indicates that the underlying problem has not been resolved. Return to the diagnostic process, re-read the codes, and take appropriate action to address the issue. Regular maintenance and prompt attention to warning signs are essential for keeping your Corolla running smoothly and reliably.
What are the most common reasons why the check engine light might come on in my 2013 Toyota Corolla?
A common culprit is a loose or faulty gas cap. This can cause a decrease in fuel efficiency and trigger the check engine light because the system detects a leak in the fuel system. Other frequent causes include issues with the oxygen sensors (O2 sensors), catalytic converter problems, malfunctioning mass airflow (MAF) sensor, or problems with the spark plugs or ignition coils. Keeping your Corolla well-maintained and addressing any unusual symptoms promptly can help prevent these issues from activating the light.
Besides the typical causes, sometimes the check engine light can illuminate due to more complex issues related to the evaporative emission control system (EVAP), which prevents fuel vapors from escaping into the atmosphere. Problems with the fuel injectors or even the vehicle’s computer system (ECU) could also be responsible. It’s always best to retrieve the trouble code using an OBD-II scanner to pinpoint the exact cause, rather than guessing, to ensure accurate and efficient repairs are made.
How can I use an OBD-II scanner to diagnose the problem causing the check engine light in my 2013 Corolla?
First, locate the OBD-II port in your 2013 Toyota Corolla. It’s typically found under the dashboard on the driver’s side. With the vehicle turned off, plug the OBD-II scanner into the port. Turn the ignition key to the “on” position, but don’t start the engine. The scanner will power up, and you can navigate through the scanner’s menu to select the option to read diagnostic trouble codes (DTCs). The scanner will then display the codes that are stored in the vehicle’s computer.
Once the codes are displayed, carefully note them down. Each code corresponds to a specific issue or component failure within the vehicle. Consult the vehicle’s repair manual, online databases, or a trusted mechanic to understand the meaning of each code. Knowing the specific codes allows you to accurately diagnose the problem causing the check engine light and determine the appropriate course of action for repair, be it replacing a faulty sensor or addressing a more complex issue.
Will disconnecting the car battery reset the check engine light on my 2013 Toyota Corolla?
Yes, disconnecting the car battery can reset the check engine light on your 2013 Toyota Corolla. However, this method simply clears the code from the vehicle’s computer memory without actually fixing the underlying problem. The light will likely reappear if the condition that triggered it in the first place is not addressed. Before resorting to this, it’s crucial to understand what caused the light to illuminate.
To properly disconnect the battery, first ensure the vehicle is turned off and the keys are removed from the ignition. Then, disconnect the negative (black) terminal first, followed by the positive (red) terminal. Leave the battery disconnected for at least 15-20 minutes. After this period, reconnect the positive terminal first, then the negative terminal. While the light may be off, remember this is a temporary fix and the underlying issue needs to be investigated to prevent future problems and potential damage.
What are the risks of driving my 2013 Toyota Corolla with the check engine light illuminated?
Driving with the check engine light on poses several risks. While sometimes it indicates a minor issue, it could also signal a more serious problem that could lead to further damage or reduced performance. Ignoring the light can potentially worsen the problem, resulting in costly repairs down the line. The vehicle might be running inefficiently, consuming more fuel than usual, or even experiencing decreased engine power.
Furthermore, if the check engine light is flashing, this typically indicates a severe engine misfire, which could potentially damage the catalytic converter if left unaddressed. It is crucial to avoid prolonged driving in this condition. A flashing light requires immediate attention to prevent further and more expensive repairs. Schedule a diagnostic check with a trusted mechanic as soon as possible to determine the cause and address the issue effectively.
How long will it typically take for the check engine light to turn off automatically after I’ve fixed the underlying problem?
The amount of time it takes for the check engine light to turn off automatically after fixing the underlying problem can vary. It depends on the specific issue that triggered the light and the driving conditions. The vehicle’s computer needs to run a series of self-tests, called “drive cycles,” to confirm that the repair has resolved the problem and that all systems are functioning correctly. These drive cycles involve a variety of driving conditions, such as varying speeds and engine loads.
Generally, it can take anywhere from a few days to a week of normal driving for the light to turn off on its own, assuming the underlying problem has been completely resolved. If the light doesn’t turn off after this period, even after several drive cycles, you may need to use an OBD-II scanner to manually clear the code or seek assistance from a mechanic to ensure that the repair was successful and that no other issues are present. Sometimes, even after the initial problem is fixed, residual codes may remain, preventing the light from automatically extinguishing.
Are there any common mistakes people make when trying to reset the check engine light on a 2013 Toyota Corolla?
One common mistake is simply disconnecting the battery without properly diagnosing or fixing the underlying issue that triggered the check engine light in the first place. This only temporarily clears the code and the light will likely reappear soon after. It is essential to use an OBD-II scanner to identify the specific trouble code and address the root cause of the problem to prevent recurrence and potential damage.
Another frequent error is neglecting to tighten the gas cap properly after refueling. A loose gas cap can cause a leak in the fuel system, triggering the check engine light. People may also mistakenly clear the code without properly verifying that the repair was successful. Always monitor the vehicle’s performance after a repair and be sure to drive the vehicle through several drive cycles to ensure that the light doesn’t return, indicating that the problem is truly resolved.
What are some preventative measures I can take to avoid the check engine light coming on in my 2013 Toyota Corolla?
Regular maintenance is key to preventing the check engine light from illuminating in your 2013 Toyota Corolla. This includes following the manufacturer’s recommended service schedule for oil changes, spark plug replacements, and air filter replacements. Regularly checking and maintaining proper fluid levels (oil, coolant, brake fluid, power steering fluid) can also help prevent issues that trigger the light. Consistent upkeep significantly reduces the chances of sensor malfunctions and other common problems.
Beyond routine maintenance, pay attention to any unusual symptoms your Corolla might exhibit, such as rough idling, decreased fuel efficiency, or unusual noises. Addressing these issues promptly can prevent them from escalating into more serious problems that trigger the check engine light. Also, ensure you always tighten the gas cap securely after refueling. By being proactive and attentive, you can significantly minimize the likelihood of encountering a check engine light issue.