Resetting the check engine light on a 2013 Toyota Corolla is possible after fixing the underlying issue. This guide walks you through safe methods, including using an OBD2 scanner or disconnecting the battery, with expert tips to avoid mistakes.
Key Takeaways
- Diagnose the problem first: Never reset the light without identifying and fixing the root cause, such as a loose gas cap or faulty oxygen sensor.
- Use an OBD2 scanner for best results: This tool reads error codes and safely clears the light without risking vehicle electronics.
- Battery disconnection is a temporary fix: While it may reset the light, it also erases radio settings and learned driving patterns.
- Drive cycle completion is essential: After resetting, drive normally for a few days so the car’s computer can complete self-tests.
- Monitor the light after reset: If it returns, there’s likely an ongoing issue that needs professional diagnosis.
- Avoid quick-fix myths: Methods like pulling fuses or using additives rarely work and can damage your vehicle.
- Keep records of repairs: Documenting fixes helps with future maintenance and resale value.
How to Reset Check Engine Light on 2013 Toyota Corolla
If you’ve recently fixed an issue with your 2013 Toyota Corolla—like tightening a loose gas cap or replacing a faulty sensor—you might be wondering how to reset the check engine light. The good news? It’s not as complicated as it seems. But before you jump into resetting the light, it’s crucial to understand why it came on in the first place.
The check engine light, also known as the malfunction indicator lamp (MIL), is your car’s way of saying, “Hey, something’s not right.” It could be something minor like a loose fuel cap or something more serious like a failing catalytic converter. Resetting the light without addressing the root cause is like turning off a fire alarm while the house is still burning—it doesn’t solve the problem.
In this guide, we’ll walk you through the safest and most effective ways to reset the check engine light on your 2013 Toyota Corolla. We’ll cover everything from using an OBD2 scanner to disconnecting the battery, plus tips to avoid common mistakes. By the end, you’ll know exactly what to do—and what not to do—to keep your Corolla running smoothly.
Why the Check Engine Light Comes On
Before we dive into resetting the light, let’s talk about why it turns on in the first place. The 2013 Toyota Corolla is equipped with an onboard diagnostic system (OBD2) that monitors various components of your vehicle, including the engine, transmission, exhaust system, and emissions controls. When the system detects a problem, it triggers the check engine light and stores a diagnostic trouble code (DTC).
Common reasons for the light to come on include:
- A loose or damaged gas cap
- A faulty oxygen (O2) sensor
- A failing mass airflow (MAF) sensor
- Catalytic converter issues
- Spark plug or ignition coil problems
- Evaporative emissions system leaks
The key takeaway? The light is a warning, not a decoration. Ignoring it can lead to reduced fuel efficiency, increased emissions, or even engine damage over time.
Method 1: Use an OBD2 Scanner (Recommended)
The safest and most reliable way to reset the check engine light on your 2013 Toyota Corolla is by using an OBD2 scanner. This handheld device plugs into your car’s diagnostic port and communicates with the engine control unit (ECU) to read and clear error codes.
What You’ll Need
- An OBD2 scanner (available at auto parts stores or online for $20–$100)
- Your 2013 Toyota Corolla
- A few minutes of your time
Step-by-Step Instructions
Step 1: Locate the OBD2 Port
The OBD2 port in your 2013 Corolla is usually located under the dashboard on the driver’s side. It’s a 16-pin connector, often black or gray, and may be tucked behind a small panel or near the steering column. If you can’t find it, check your owner’s manual or look just below the steering wheel.
Visual guide about How to Reset Check Engine Light on 2013 Toyota Corolla
Image source: dealerimages.dealereprocess.com
Step 2: Turn Off the Engine
Make sure your car is completely off before plugging in the scanner. This prevents any electrical interference and ensures a clean connection.
Step 3: Plug in the Scanner
Insert the OBD2 scanner into the port. It should fit snugly—don’t force it. Most scanners will power on automatically once connected.
Step 4: Turn the Ignition to “On”
Turn the key to the “ON” position (but don’t start the engine). This powers up the car’s electrical system and allows the scanner to communicate with the ECU.
Step 5: Read the Error Codes
Follow the scanner’s instructions to read the stored trouble codes. Most devices will display codes like P0420 (catalytic converter efficiency) or P0171 (system too lean). Write these down—they’ll help you understand what caused the light to come on.
Step 6: Clear the Codes
Once you’ve confirmed the issue has been fixed (e.g., you replaced a bad O2 sensor), use the scanner’s “Clear Codes” or “Erase DTCs” function. This will reset the check engine light.
Step 7: Turn Off the Ignition and Unplug
Turn the key back to “OFF” and unplug the scanner. Start your car to confirm the light is off.
Tips for Using an OBD2 Scanner
- Choose a scanner with a clear display and easy navigation. Basic models work fine for resetting lights, but advanced ones can show live data and freeze-frame information.
- If the light comes back on after clearing, the problem wasn’t fully resolved. Recheck the repair or consult a mechanic.
- Some scanners require you to drive a short distance after clearing codes to complete the reset. Follow the device’s instructions.
Method 2: Disconnect the Battery (Alternative Method)
If you don’t have an OBD2 scanner, you can reset the check engine light by disconnecting the car battery. This method forces the ECU to reset by cutting power, but it’s not as precise as using a scanner.
What You’ll Need
- Wrench or socket set (usually 10mm)
- Safety gloves and glasses
- Your 2013 Toyota Corolla
Step-by-Step Instructions
Step 1: Turn Off the Engine and Remove the Key
Make sure the car is off and the key is out of the ignition. This prevents any electrical surges.
Step 2: Locate the Battery
The battery in your 2013 Corolla is under the hood, on the driver’s side. It’s a standard 12-volt lead-acid battery with positive (+) and negative (-) terminals.
Step 3: Disconnect the Negative Terminal
Use a wrench to loosen the nut on the negative (black) terminal. Carefully remove the cable and tuck it away from the battery so it doesn’t accidentally reconnect.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This gives the ECU time to fully reset. Some experts recommend up to 30 minutes for a complete reset.
Step 5: Reconnect the Battery
Reattach the negative cable and tighten the nut securely. Make sure it’s snug but don’t overtighten.
Step 6: Start the Car
Turn the ignition to “ON” and then start the engine. The check engine light should be off. If it’s still on, the issue may not be resolved, or the reset didn’t take.
Important Notes About Battery Disconnection
- This method may reset other systems, including your radio presets, clock, and power window settings. You’ll need to reprogram these after reconnecting.
- The ECU may take a few drive cycles to relearn your driving habits, which can temporarily affect fuel economy and performance.
- Disconnecting the battery won’t clear all trouble codes permanently. If the problem persists, the light will return.
Method 3: Drive Cycle Reset (Natural Clearing)
In some cases, the check engine light will turn off on its own after the problem is fixed—no tools required. This is called a “drive cycle reset” and happens when the car’s computer completes a series of self-tests and confirms everything is working properly.
How It Works
The OBD2 system runs continuous checks on various components. When a fault is detected, the light comes on. If the issue is resolved and the system passes all tests over multiple drive cycles, the light may automatically turn off.
Typical Drive Cycle for 2013 Corolla
To help the system complete its checks, follow this general drive pattern:
- Start the car cold and let it idle for 2–3 minutes.
- Drive at 30–40 mph for 5–10 minutes.
- Accelerate to 55–60 mph and maintain speed for 10–15 minutes.
- Decelerate gradually and come to a stop.
- Repeat this cycle 2–3 times over a few days.
When This Method Works Best
- After fixing a minor issue like a loose gas cap.
- When the problem was intermittent and hasn’t recurred.
- If you prefer not to use tools or disconnect the battery.
Limitations
- Not all codes will clear automatically. Persistent or severe issues will keep the light on.
- It can take several days of driving for the system to complete all tests.
- You won’t know which codes were stored unless you use a scanner.
What NOT to Do When Resetting the Light
There are several myths and bad practices floating around about resetting the check engine light. Avoid these at all costs:
Don’t Use Fuel Additives as a “Reset”
Some products claim to clean your fuel system and turn off the check engine light. While fuel system cleaners can help with carbon buildup, they won’t fix mechanical issues or clear error codes. Save your money and address the real problem.
Don’t Pull Fuses Randomly
Removing fuses to reset the ECU is risky and can damage electrical systems. It’s not a reliable method and may cause more problems than it solves.
Don’t Ignore the Light
Resetting the light without fixing the issue is dangerous. You could be driving with a serious problem that leads to costly repairs or even a breakdown.
Don’t Use “Quick Fix” Devices
Beware of gadgets that claim to “trick” the ECU into turning off the light. These are scams and can interfere with your car’s diagnostics.
Troubleshooting Common Issues
Even after following the steps above, you might run into problems. Here’s how to handle them:
The Light Comes Back On
If the check engine light returns after resetting, the original issue wasn’t fully resolved. Use an OBD2 scanner to read the new codes and diagnose the problem. Common culprits include:
- A gas cap that wasn’t tightened properly
- A sensor that needs recalibration
- An intermittent electrical fault
The Light Won’t Turn Off
If the light remains on after a reset, there may be an active fault. Try driving through a complete drive cycle. If that doesn’t work, visit a mechanic or auto parts store for a free code scan.
Battery Disconnection Didn’t Work
Some ECUs require a specific sequence to reset. Try disconnecting both terminals (positive and negative) for 30 minutes. Also, ensure the battery is fully charged—low voltage can prevent a proper reset.
Scanner Won’t Connect
If your OBD2 scanner won’t communicate with the car, check the following:
- The ignition is in the “ON” position
- The scanner is compatible with OBD2 (all 1996+ cars are)
- The OBD2 port isn’t damaged or corroded
- The scanner’s software is up to date
Preventing Future Check Engine Light Issues
The best way to avoid resetting the light is to prevent it from coming on in the first place. Here are some maintenance tips for your 2013 Corolla:
- Check the gas cap regularly: Make sure it’s tight after every fill-up. A loose cap is one of the most common causes of the light.
- Follow the maintenance schedule: Replace spark plugs, air filters, and oxygen sensors as recommended in your owner’s manual.
- Use quality fuel: Stick to reputable gas stations to avoid contaminated fuel.
- Listen for unusual sounds: Knocking, pinging, or rough idling can signal engine problems.
- Get regular inspections: A quick scan at an auto parts store can catch issues early.
Conclusion
Resetting the check engine light on your 2013 Toyota Corolla is a straightforward process—but only after you’ve fixed the underlying issue. The best method is using an OBD2 scanner, which safely clears codes without disrupting other systems. Disconnecting the battery is a viable alternative, though it comes with trade-offs like lost radio settings. And in some cases, the light may turn off on its own after a proper drive cycle.
Remember, the check engine light is there to protect your car. Don’t ignore it or try to bypass it with gimmicks. Address the root cause, reset the light properly, and keep up with regular maintenance. Your Corolla will thank you with better performance, fuel efficiency, and reliability for years to come.