This guide walks you through how to reset check engine light FRS 2013 using simple methods like driving cycles, OBD2 scanners, and battery disconnects. Always diagnose the root cause first to avoid recurring issues.
Key Takeaways
- Diagnose the problem first: Never reset the check engine light without identifying and fixing the underlying issue, such as a loose gas cap or faulty oxygen sensor.
- Use an OBD2 scanner for accuracy: This is the most reliable method to clear codes and reset the light on your 2013 Scion FR-S.
- Driving cycles can auto-reset the light: After repairs, completing a specific driving pattern may allow the car’s computer to turn off the light naturally.
- Battery disconnect is a last resort: While it can reset the system, it also clears radio settings and adaptive learning data.
- Monitor after reset: Always check if the light returns—this indicates an unresolved problem.
- Keep records of repairs: Documenting fixes helps with future diagnostics and resale value.
- Use quality parts: Cheap replacements may cause the light to come back quickly.
How to Reset Check Engine Light FRS 2013
If you own a 2013 Scion FR-S, you know it’s a fun, lightweight sports car with a responsive engine and sharp handling. But like any vehicle, it’s not immune to warning lights—especially the dreaded check engine light. Seeing that amber glow on your dashboard can be stressful, but don’t panic. In this guide, we’ll walk you through how to reset check engine light FRS 2013 safely and effectively.
You’ll learn multiple methods, from using an OBD2 scanner to performing a driving cycle or even disconnecting the battery. We’ll also cover why the light came on in the first place, how to avoid common mistakes, and what to do if the light keeps coming back. Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, this guide has you covered.
By the end, you’ll feel confident handling this common issue and keeping your FR-S running smoothly.
Why the Check Engine Light Comes On
Visual guide about How to Reset Check Engine Light Frs 2013
Image source: mechanicbase.com
Before we dive into resetting the light, it’s important to understand why it turned on in the first place. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your car’s onboard diagnostics system (OBD2). When the engine control unit (ECU) detects a problem with the engine, emissions, or related systems, it stores a diagnostic trouble code (DTC) and triggers the light.
Common causes in the 2013 Scion FR-S include:
- Loose or faulty gas cap: This is the #1 cause of check engine lights. A loose cap allows fuel vapors to escape, triggering an evaporative emissions code (like P0455).
- Oxygen (O2) sensor failure: These sensors monitor exhaust gases and help regulate fuel mixture. A bad O2 sensor can reduce fuel efficiency and increase emissions.
- Mass airflow (MAF) sensor issues: Dirt or damage to the MAF sensor can cause rough idling, poor acceleration, and a check engine light.
- Spark plug or ignition coil problems: Misfires (code P0300-P0304) are common in high-revving engines like the FR-S’s 2.0L boxer.
- Catalytic converter inefficiency: Over time, the catalytic converter can degrade, leading to reduced performance and emissions issues.
- Exhaust gas recirculation (EGR) valve faults: A clogged or stuck EGR valve can cause rough running and trigger codes like P0401.
Ignoring the light can lead to decreased fuel economy, increased emissions, and even engine damage. So, always diagnose the issue before resetting.
Tools You’ll Need
Before resetting the check engine light, gather these tools:
- OBD2 scanner: A basic code reader (around $20–$50) is sufficient for most users. Look for one with a clear display and easy navigation.
- Owner’s manual: Your FR-S manual has useful info on dashboard lights and maintenance.
- Safety gloves and glasses: Especially if you’re disconnecting the battery.
- Flashlight: Helps you see under the dashboard or near the battery.
- Clean rag: For wiping the gas cap or cleaning sensors.
Optional but helpful:
- Multimeter: To test sensor voltages or battery health.
- Scan tool with live data: More advanced tools let you monitor real-time engine data.
Method 1: Use an OBD2 Scanner (Recommended)
The most reliable and safest way to reset the check engine light on your 2013 Scion FR-S is with an OBD2 scanner. This method allows you to read the trouble code, understand the problem, and clear it—all without guessing.
Step 1: Locate the OBD2 Port
In the 2013 Scion FR-S, the OBD2 port is located under the dashboard on the driver’s side. It’s a 16-pin connector, usually black or gray, and shaped like a trapezoid. You’ll find it near the steering column, just below the knee panel. You may need to crouch down or use a flashlight to see it clearly.
Step 2: Turn Off the Ignition
Make sure the car is off and the key is removed. This prevents any electrical issues when plugging in the scanner.
Step 3: Plug in the OBD2 Scanner
Insert the scanner’s connector into the OBD2 port. It should fit snugly—don’t force it. Once connected, turn the ignition to the “ON” position (but don’t start the engine). This powers up the scanner and allows it to communicate with the ECU.
Step 4: Read the Trouble Code
Follow the scanner’s instructions to read the code. Most basic scanners have a “Read” or “Scan” button. Press it, and the device will display a code like P0420 or P0171.
Write down the code. You can look it up online or in the scanner’s manual to understand what it means. For example:
- P0420: Catalyst system efficiency below threshold
- P0171: System too lean (bank 1)
- P0455: Large evaporative emission leak
Step 5: Fix the Underlying Issue
Before clearing the code, fix the problem. For example:
- If the code is P0455, check the gas cap. Tighten it or replace it if cracked.
- If it’s P0133 (O2 sensor slow response), inspect the sensor for damage or corrosion.
- If it’s a misfire code, check spark plugs and ignition coils.
Never clear the code without addressing the root cause. Otherwise, the light will come back—and you’ll be back to square one.
Step 6: Clear the Code
Once the issue is fixed, use the scanner to clear the code. Look for a “Clear” or “Erase” button. Press it, and the scanner will send a command to the ECU to reset the check engine light.
You should see a confirmation message like “Codes cleared” or “Reset successful.”
Step 7: Turn Off the Ignition and Unplug
Turn the key back to “OFF” and unplug the scanner. Start the car to confirm the light is off. If it stays off, great! If it comes back on, the problem may not be fully resolved.
Pro Tips for Using an OBD2 Scanner
- Use a reputable brand: BlueDriver, Innova, and Autel make reliable scanners.
- Update the scanner’s software: Some models allow firmware updates for better compatibility.
- Check for pending codes: Some scanners show “pending” codes that haven’t triggered the light yet.
- Save the data: If your scanner has a memory function, save the code and freeze frame data for future reference.
Method 2: Complete a Driving Cycle
Sometimes, after a repair, the check engine light will turn off on its own—if you complete a “driving cycle.” This is a series of driving conditions that allow the ECU to run its self-tests and confirm the problem is fixed.
The 2013 Scion FR-S uses a specific driving cycle to reset emissions monitors. Here’s how to do it:
Step 1: Ensure the Battery Hasn’t Been Disconnected Recently
If you’ve recently disconnected the battery or used a scanner to clear codes, the ECU may need time to relearn. Wait at least 24 hours before starting the driving cycle.
Step 2: Start with a Cold Engine
Let the car sit overnight so the engine is cold. Start the car and let it idle for about 2 minutes.
Step 3: Drive at Moderate Speeds
Drive at 30–40 mph for about 5 minutes. This warms up the engine and oxygen sensors.
Step 4: Accelerate and Decelerate
Accelerate to 55 mph, then coast down to 20 mph without braking hard. Repeat this 3–5 times. This helps the ECU test the catalytic converter and O2 sensors.
Step 5: Highway Driving
Drive on the highway at a steady 60–65 mph for 10–15 minutes. This allows the ECU to monitor fuel trim and emissions systems.
Step 6: Stop and Idle
Come to a complete stop and let the car idle for 3–5 minutes. Then turn it off.
Step 7: Check the Light
After completing the cycle, check if the check engine light is off. It may take a few cycles for all monitors to reset.
Important Notes
- Not all codes reset automatically: Some issues, like a faulty catalytic converter, may require a scanner to clear.
- Patience is key: It can take 3–5 driving cycles over several days for the light to turn off.
- Keep the fuel tank between 1/4 and 3/4 full: This ensures accurate fuel system monitoring.
Method 3: Disconnect the Battery (Last Resort)
Disconnecting the battery can reset the ECU and turn off the check engine light—but it’s not the best method. It clears adaptive learning data, radio presets, and clock settings. Use it only if you don’t have a scanner and the light won’t go off after repairs.
Step 1: Turn Off the Car and Remove the Key
Make sure the ignition is off and the key is out of the ignition.
Step 2: Locate the Battery
In the 2013 Scion FR-S, the battery is in the trunk on the passenger side. Open the trunk and remove the cover to access it.
Step 3: Disconnect the Negative Terminal
Use a wrench (usually 10mm) to loosen the nut on the negative (black) terminal. Carefully remove the cable and tuck it away from the battery.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU to fully reset. For a deeper reset, wait 30 minutes.
Step 5: Reconnect the Battery
Reattach the negative terminal and tighten the nut securely.
Step 6: Start the Car
Turn the ignition on and start the engine. The check engine light may be off—but it could come back if the problem isn’t fixed.
What to Expect After Battery Disconnect
- Radio presets will be lost: You’ll need to reprogram your favorite stations.
- Clock and trip meter reset: Set the time and odometer manually.
- Adaptive learning resets: The ECU will relearn fuel trims and shift points over time.
- Check engine light may return: If the issue persists, the light will come back on.
Troubleshooting: What If the Light Comes Back?
If the check engine light returns after resetting, don’t panic—but don’t ignore it either. Here’s what to do:
Check for Intermittent Issues
Some problems, like a loose gas cap or a failing sensor, may not trigger the light immediately. Recheck your repairs. For example, if you tightened the gas cap, make sure it’s fully seated and the seal is intact.
Scan for New Codes
Use your OBD2 scanner to read the new code. It might be the same as before—or a different one entirely. Compare it to the original code to see if the problem has changed.
Inspect Related Components
Sometimes one issue causes another. For example, a bad O2 sensor can lead to a catalytic converter code. Inspect related parts and wiring.
Check for Software Updates
Toyota occasionally releases ECU software updates for the FR-S. Visit a dealership or check online forums to see if a TSB (Technical Service Bulletin) applies to your issue.
Consult a Professional
If you’ve tried everything and the light keeps coming back, it’s time to see a mechanic. They have advanced tools and can perform tests like smoke testing for vacuum leaks or scope testing for ignition issues.
Preventing Future Check Engine Lights
An ounce of prevention is worth a pound of cure. Here’s how to avoid future check engine lights on your 2013 Scion FR-S:
- Tighten the gas cap after every fill-up: Make sure it clicks 3–5 times.
- Use quality fuel: Avoid cheap gas with high ethanol content.
- Replace spark plugs on time: The FR-S recommends replacement every 60,000–100,000 miles.
- Clean the MAF sensor: Use MAF cleaner spray every 15,000–20,000 miles.
- Check for recalls: Visit the NHTSA website to see if your FR-S has any open recalls.
- Keep up with maintenance: Follow the scheduled service intervals in your owner’s manual.
Conclusion
Resetting the check engine light on your 2013 Scion FR-S doesn’t have to be intimidating. Whether you use an OBD2 scanner, complete a driving cycle, or disconnect the battery, the key is to diagnose and fix the problem first. Simply clearing the code without addressing the root cause is like putting a bandage on a broken bone—it won’t last.
By following this guide, you’ll save money, avoid unnecessary repairs, and keep your FR-S running at its best. Remember: the check engine light is there to help you. Respect it, understand it, and respond to it wisely.
With the right tools and a little patience, you’ve got this.