Resetting the check engine light on your 2013 Toyota Highlander is possible after fixing the underlying issue. This guide walks you through safe methods, including using an OBD2 scanner, disconnecting the battery, and driving cycles—ensuring your vehicle runs smoothly and passes emissions tests.
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 accuracy: This tool reads error codes and safely clears the light while confirming repairs were successful.
- Battery disconnection is a temporary fix: While it may reset the light, it also erases radio settings and adaptive learning data.
- Drive cycle completion is essential: After resetting, drive your Highlander under normal conditions so the onboard computer can relearn and verify no issues remain.
- Avoid quick fixes that mask problems: Ignoring persistent codes can lead to costly engine damage or failed emissions tests.
- Keep records of repairs and resets: Documentation helps with future diagnostics and maintains resale value.
- Seek professional help if unsure: If the light returns frequently, consult a certified Toyota technician for thorough diagnosis.
How to Reset Check Engine Light on 2013 Toyota Highlander
If you’ve noticed the check engine light glowing on your 2013 Toyota Highlander’s dashboard, you’re not alone. This warning light can appear for a wide range of reasons—from something as simple as a loose gas cap to more serious engine or emissions system issues. While it’s natural to want to turn it off quickly, the most important step is understanding why it came on in the first place. Once you’ve addressed the underlying problem, resetting the check engine light is a straightforward process.
In this comprehensive guide, you’ll learn how to safely and effectively reset the check engine light on your 2013 Toyota Highlander. We’ll cover multiple methods, including using an OBD2 scanner, disconnecting the battery, and allowing the vehicle to complete a drive cycle. You’ll also get practical tips, troubleshooting advice, and important warnings to ensure you don’t accidentally mask a serious issue. Whether you’re a DIY enthusiast or just looking to save a trip to the mechanic, this guide will help you take control of your vehicle’s health.
Why the Check Engine Light Comes On
Visual guide about How to Reset Check Engine Light on 2013 Toyota Highlander
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Before jumping into resetting the light, it’s crucial to understand what triggers it. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your Highlander’s onboard diagnostics system (OBD2). This system continuously monitors engine performance, emissions, and various sensors. When it detects a problem that could affect emissions or engine efficiency, it stores a diagnostic trouble code (DTC) and illuminates the light.
Common causes for the check engine light in a 2013 Toyota Highlander include:
- Loose or damaged gas cap: This is one of the most frequent culprits. A loose cap allows fuel vapors to escape, triggering an evaporative emissions system fault.
- Faulty oxygen (O2) sensor: These sensors monitor exhaust gases and help regulate the air-fuel mixture. A failing sensor can reduce fuel efficiency and increase emissions.
- Catalytic converter issues: Over time, the catalytic converter can become clogged or damaged, leading to reduced performance and higher emissions.
- Mass airflow (MAF) sensor problems: This sensor measures the amount of air entering the engine. A dirty or faulty MAF can cause rough idling and poor acceleration.
- Spark plug or ignition coil failure: Worn spark plugs or failing coils can cause misfires, which the OBD2 system detects immediately.
- Evaporative emissions system leaks: Small leaks in the fuel vapor system can trigger codes like P0440 or P0455.
Ignoring the check engine light—even if the car seems to run fine—can lead to decreased fuel economy, increased emissions, and potential damage to expensive components like the catalytic converter. That’s why diagnosing the issue before resetting the light is essential.
Method 1: Using an OBD2 Scanner (Recommended)
The safest and most accurate way to reset the check engine light on your 2013 Toyota Highlander is by using an OBD2 scanner. This handheld device plugs into your vehicle’s diagnostic port and communicates with the onboard computer to read trouble codes and clear the light.
Step 1: Locate the OBD2 Port
The OBD2 port in the 2013 Toyota Highlander is typically located under the dashboard on the driver’s side. You’ll find it near the steering column, usually just above the brake pedal. It’s a 16-pin connector that looks like a trapezoid-shaped plug. You may need to crouch down or use a flashlight to spot it, but it’s usually within easy reach.
Step 2: Turn the Ignition to the “On” Position
Insert your key into the ignition and turn it to the “On” position—but do not start the engine. This powers up the vehicle’s electrical system and allows the OBD2 scanner to communicate with the computer. You’ll see dashboard lights illuminate, including the check engine light.
Step 3: Connect the OBD2 Scanner
Plug the OBD2 scanner into the diagnostic port. Make sure it’s securely connected. Most scanners will power on automatically once plugged in. If yours has a power button, press it to turn it on.
Step 4: Read the Trouble Codes
Follow the scanner’s on-screen instructions to read the diagnostic trouble codes (DTCs). Common codes for the 2013 Highlander include:
- P0457: Evaporative emission system leak detected (fuel cap loose)
- P0135: Oxygen sensor heater circuit malfunction (bank 1, sensor 1)
- P0300: Random/multiple cylinder misfire detected
- P0420: Catalyst system efficiency below threshold
Write down the codes or take a photo for reference. Many scanners also provide a brief description of each code, which can help you understand the issue.
Step 5: Fix the Underlying Problem
Once you’ve identified the code, take steps to fix the issue. For example:
- If the code is P0457, check and tighten the gas cap. Replace it if it’s cracked or damaged.
- If it’s P0135, the oxygen sensor may need replacement. This is a job best left to a professional unless you’re experienced with automotive repairs.
- If it’s P0300, inspect spark plugs, ignition coils, and fuel injectors.
Never reset the light without addressing the root cause. Doing so may cause the light to return—or worse, allow a serious problem to go unnoticed.
Step 6: Clear the Codes and Reset the Light
After the repair is complete, return to the OBD2 scanner. Use the “Clear Codes” or “Erase DTCs” function to reset the check engine light. The scanner will send a command to the vehicle’s computer to turn off the light and clear stored codes.
Once cleared, the check engine light should turn off. Turn the ignition off, wait 10–15 seconds, then restart the engine to confirm the light stays off.
Step 7: Complete a Drive Cycle
After resetting, your Highlander needs to complete a drive cycle so the onboard computer can relearn and verify that no issues remain. A typical drive cycle includes:
- Start the engine 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 several minutes.
- Decelerate and stop, then repeat the cycle.
This process allows the computer to test emissions systems and confirm repairs were successful. If the light stays off after a full drive cycle, the reset was successful.
Method 2: Disconnecting the Battery
If you don’t have an OBD2 scanner, you can reset the check engine light by disconnecting the battery. This method forces the vehicle’s computer to reset, clearing stored codes and turning off the light. However, it’s less precise and comes with drawbacks.
Step 1: Turn Off the Engine and Remove the Key
Make sure the engine is off and the key is removed from the ignition. This prevents electrical surges or damage during the process.
Step 2: Locate the Battery
Open the hood and locate the 12-volt battery. In the 2013 Toyota Highlander, it’s typically on the driver’s side of the engine bay.
Step 3: Disconnect the Negative Terminal
Use a wrench or socket to loosen the nut on the negative (black) battery terminal. Carefully remove the cable and tuck it away from the battery to prevent accidental contact. Do not disconnect the positive (red) terminal unless necessary—this increases the risk of short circuits.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the vehicle’s computer to fully discharge and reset. Some sources recommend up to 30 minutes for a complete reset.
Step 5: Reconnect the Battery
Reattach the negative terminal and tighten the nut securely. Make sure the connection is tight to avoid electrical issues.
Step 6: Start the Engine
Turn the ignition to the “On” position and wait for dashboard lights to illuminate. Then start the engine. The check engine light should be off—at least temporarily.
Important Considerations
While disconnecting the battery can reset the light, it also resets other systems:
- Radio presets and clock settings will be lost.
- Adaptive learning data (such as fuel trim and transmission shift points) will be erased, which may cause temporary rough idling or shifting.
- The light may return if the underlying issue wasn’t fixed.
This method is best used as a temporary solution or when an OBD2 scanner isn’t available. Always diagnose the problem first.
Method 3: Drive Cycle Reset (No Tools Required)
In some cases, the check engine light may turn off on its own after the problem is fixed and the vehicle completes a drive cycle. This is known as a “self-clearing” code. However, this only works for certain types of faults—typically those that are intermittent or minor.
How It Works
The OBD2 system continuously monitors sensors and systems. If a fault is no longer detected over several drive cycles, the computer may automatically clear the code and turn off the light. For example, if you tightened a loose gas cap, the system might detect the fix during normal driving and reset itself.
Steps to Encourage a Drive Cycle Reset
To help the system recognize the repair:
- Drive the vehicle under a variety of conditions: city driving, highway speeds, idling, and acceleration.
- Complete at least 3–5 full drive cycles over several days.
- Ensure the gas cap is tight and all repairs are complete.
If the light remains off after a week of normal driving, the reset was successful. However, if it returns, use an OBD2 scanner to check for new or recurring codes.
Troubleshooting Common Issues
Even after resetting the check engine light, you may encounter problems. Here’s how to troubleshoot:
The Light Comes Back On
If the check engine light returns shortly after resetting, the original issue likely wasn’t fully resolved. Use an OBD2 scanner to read the new codes. Common reasons for recurrence include:
- Incomplete repairs (e.g., replacing a gas cap but not tightening it properly)
- Multiple underlying issues (e.g., a bad O2 sensor and a misfire)
- Intermittent faults that haven’t been triggered again yet
The Light Won’t Turn Off
If the light remains on after using an OBD2 scanner or disconnecting the battery, there may be a persistent fault. Possible causes:
- A failing sensor that needs replacement
- An electrical issue, such as a short or damaged wiring
- A problem with the vehicle’s computer (rare, but possible)
In these cases, consult a certified Toyota technician for a full diagnostic.
Radio or Settings Reset After Battery Disconnection
As mentioned earlier, disconnecting the battery resets non-volatile memory. To restore settings:
- Reprogram radio presets manually.
- Reset the clock and trip odometer.
- Re-sync key fobs if they stop working (turn ignition on/off several times).
Some Highlanders may require a dealership or specialized tool to restore adaptive learning data.
When to See a Mechanic
While many check engine light issues can be resolved at home, some require professional attention. Seek help if:
- The light flashes (indicating a severe misfire that can damage the catalytic converter)
- You’re unsure how to interpret or fix the trouble code
- The vehicle is running poorly, overheating, or losing power
- The light returns repeatedly after multiple resets
Toyota dealerships and certified mechanics have advanced diagnostic tools and access to technical service bulletins (TSBs) specific to the 2013 Highlander. They can also perform emissions tests and ensure your vehicle meets state requirements.
Preventing Future Check Engine Light Issues
The best way to avoid check engine light problems is through regular maintenance:
- Replace the gas cap if damaged: A cracked or worn cap can cause evaporative leaks.
- Use quality fuel: Low-quality gasoline can lead to carbon buildup and sensor issues.
- Follow the maintenance schedule: Replace spark plugs, air filters, and oxygen sensors as recommended (typically every 60,000–100,000 miles).
- Inspect hoses and wiring: Look for cracks, leaks, or corrosion during oil changes.
- Keep the engine clean: Dirt and debris can affect sensor performance.
Regular care not only prevents check engine lights but also extends the life of your Highlander.
Conclusion
Resetting the check engine light on your 2013 Toyota Highlander is a manageable task—but only after you’ve addressed the root cause. Whether you use an OBD2 scanner, disconnect the battery, or rely on a drive cycle, the key is ensuring the problem is truly fixed. Ignoring the light or resetting it prematurely can lead to bigger issues down the road.
By following the steps in this guide, you can confidently diagnose, repair, and reset the check engine light while maintaining your vehicle’s performance and emissions compliance. Remember: a little prevention and timely action go a long way in keeping your Highlander running smoothly for years to come.