Resetting the engine light on your Subaru Crosstrek doesn’t have to be intimidating. This guide walks you through simple methods—from basic driving cycles to using an OBD2 scanner—so you can clear the light and ensure your vehicle runs smoothly.
Key Takeaways
- Understand why the light came on: The engine light (or check engine light) signals a problem detected by your car’s onboard diagnostics system. Resetting it without fixing the issue won’t solve the root cause.
- Use the right tools: An OBD2 scanner is the most reliable way to reset the light. Basic models are affordable and easy to use.
- Try a driving cycle first: Some minor issues may resolve on their own after a few normal driving trips, allowing the light to turn off automatically.
- Disconnect the battery as a last resort: This method can reset the light but may also erase radio settings and adaptive learning data.
- Always verify the fix: After resetting, monitor your Crosstrek. If the light returns, have the issue diagnosed by a professional.
- Prevent future warnings: Regular maintenance—like changing the oil, replacing air filters, and using quality fuel—can reduce the chances of the engine light coming on.
- Know your model year: 2013–2024 Subaru Crosstreks have similar systems, but slight variations exist. Always check your owner’s manual for model-specific advice.
How to Reset an Engine Light on Subaru Crosstrek
If you’ve noticed the engine light glowing on your Subaru Crosstrek’s dashboard, you’re not alone. This warning—often called the “check engine light” or “malfunction indicator lamp” (MIL)—is one of the most common alerts drivers see. While it can be alarming, it’s actually your car’s way of saying, “Hey, something needs attention.” The good news? Resetting the engine light on a Subaru Crosstrek is often straightforward, especially once the underlying issue has been resolved.
In this comprehensive guide, you’ll learn exactly how to reset the engine light on your Subaru Crosstrek—whether you’re driving a 2013 model or a brand-new 2024. We’ll walk you through multiple methods, from simple driving techniques to using professional tools like an OBD2 scanner. You’ll also discover when it’s safe to reset the light yourself and when it’s best to visit a mechanic. By the end, you’ll feel confident handling this common automotive task and keeping your Crosstrek running smoothly.
Why Is the Engine Light On?
Visual guide about How to Reset an Engine Light on Subaru Crosstrek
Image source: oilreset.com
Before you reset the engine light, it’s important to understand why it came on in the first place. The engine light is part of your Subaru’s onboard diagnostics system (OBD2), which constantly monitors engine performance, emissions, and other critical systems. When a sensor detects an anomaly—like a misfire, low fuel pressure, or a loose gas cap—the system triggers the warning light.
Common causes include:
– A loose or faulty gas cap
– Oxygen (O2) sensor failure
– Mass airflow (MAF) sensor issues
– Catalytic converter problems
– Spark plug or ignition coil faults
– Evaporative emissions system leaks
Some of these issues are minor and easy to fix, like tightening the gas cap. Others may require professional diagnosis and repair. That’s why resetting the light without addressing the root cause is like turning off a smoke alarm while the fire still burns—it doesn’t solve the problem.
Can You Reset the Engine Light Yourself?
Yes—most drivers can reset the engine light on their Subaru Crosstrek without visiting a dealership. However, it’s crucial to first determine whether the issue has been resolved. If the problem persists, resetting the light will only make it come back on after a short drive.
For example, if your engine light came on because the gas cap was loose, tightening it may allow the system to self-correct after a few driving cycles. In that case, the light might turn off on its own. But if the light is due to a failing oxygen sensor, simply resetting it won’t fix the sensor—and the light will return.
So, before resetting, ask yourself:
– Did I recently fix a known issue (like replacing a gas cap)?
– Has the car been running normally since the light appeared?
– Am I planning to use an OBD2 scanner to check for active trouble codes?
If you answered “yes” to any of these, you’re likely ready to reset the light.
Method 1: Let the Light Turn Off Automatically
The simplest way to “reset” the engine light is to let your Subaru Crosstrek do it for you. Many minor issues—especially those related to emissions or temporary sensor glitches—can resolve on their own after a few normal driving trips.
How It Works
Your Crosstrek’s computer runs self-tests during each drive. These tests check systems like the catalytic converter, oxygen sensors, and evaporative emissions. If a problem was temporary—like a loose gas cap that you’ve since tightened—the system may pass its tests after a few cycles and turn off the light automatically.
What Is a Driving Cycle?
A driving cycle refers to a series of driving conditions that allow the vehicle’s computer to complete all its diagnostic tests. For most Subaru models, this includes:
– Starting the engine when cold
– Driving at varying speeds (city and highway)
– Accelerating and decelerating smoothly
– Letting the engine reach normal operating temperature
A typical driving cycle might look like this:
1. Start the car after it’s been off for at least 8 hours (cold start).
2. Drive for 5–10 minutes in stop-and-go traffic.
3. Accelerate to highway speeds (55–65 mph) and maintain for 10–15 minutes.
4. Slow down gradually and come to a complete stop.
5. Repeat this pattern over 2–3 days.
How Long Does It Take?
In many cases, the engine light will turn off after 3–5 successful driving cycles—usually within a week of normal driving. However, if the light remains on after two weeks of regular use, it’s likely that a real issue still exists.
When to Use This Method
This approach works best for:
– Recently tightened gas caps
– Temporary sensor glitches
– Minor emissions system hiccups
It’s not effective for persistent mechanical problems.
Method 2: Use an OBD2 Scanner (Recommended)
The most reliable and accurate way to reset the engine light on your Subaru Crosstrek is by using an OBD2 (On-Board Diagnostics, Generation 2) scanner. This small device plugs into your car’s diagnostic port and communicates directly with the engine control unit (ECU).
Why Use an OBD2 Scanner?
An OBD2 scanner does more than just reset the light—it also:
– Reads trouble codes (like P0420 or P0171)
– Tells you exactly what’s wrong
– Confirms whether the issue has been fixed
– Clears codes and turns off the light
This makes it an essential tool for any Crosstrek owner.
What You’ll Need
– An OBD2 scanner (basic models start around $20)
– Your Subaru Crosstrek (engine off)
– About 5 minutes of time
Step-by-Step Instructions
Step 1: Locate the OBD2 Port
In all Subaru Crosstreks (2013–2024), the OBD2 port is located under the dashboard on the driver’s side. It’s usually near the steering column, about knee-level. It’s a 16-pin connector that looks like a trapezoid.
Tip: If you can’t find it, check behind a small panel or look for a cover labeled “OBD” or “DIAG.”
Step 2: Plug in the Scanner
Turn off the engine and insert the OBD2 scanner into the port. Make sure it’s fully seated. Some scanners will power on automatically when plugged in.
Step 3: Turn on the Ignition
Turn the key to the “ON” position (but don’t start the engine). This powers up the car’s electronics and allows the scanner to communicate with the ECU.
Step 4: Read the Codes
Follow the scanner’s instructions to read the trouble codes. Most basic scanners have a “Read” or “Scan” button. The device will display one or more codes (e.g., P0455 for a large evaporative leak).
Write down the codes. You can look them up online or use the scanner’s built-in database to understand what they mean.
Step 5: Fix the Issue (If Needed)
If the code indicates a problem you can fix—like a loose gas cap—do so now. For example:
– Tighten or replace the gas cap
– Clean the MAF sensor with specialized cleaner
– Replace a faulty oxygen sensor (if you’re experienced)
If you’re unsure how to fix the issue, consult a mechanic or use online resources like Subaru forums or repair guides.
Step 6: Clear the Codes
Once the issue is resolved, use the scanner to clear the trouble codes. Look for a “Clear” or “Erase” button. Confirm the action when prompted.
The scanner will send a command to the ECU to turn off the engine light and reset the system.
Step 7: Verify the Reset
Turn off the ignition, wait 10 seconds, then restart the car. The engine light should be off. If it comes back on immediately, the problem may not be fully resolved.
Recommended OBD2 Scanners
– BlueDriver Bluetooth Scanner: Pairs with your smartphone via app. Great for detailed diagnostics.
– Innova 3100: Affordable, easy to use, with code definitions on screen.
– Autel MaxiCOM MK808: Professional-grade, but more expensive. Ideal for frequent use.
Tip: Many auto parts stores (like AutoZone or O’Reilly) offer free code reading. You can use this service to diagnose the issue before buying a scanner.
Method 3: Disconnect the Battery (Not Recommended)
Some drivers try to reset the engine light by disconnecting the car battery. While this can work, it’s not the best method and comes with risks.
How It Works
Disconnecting the battery cuts power to the ECU, which can reset the system and clear stored trouble codes. However, this method is unreliable and may not work on newer vehicles with persistent memory.
Step-by-Step Instructions
Step 1: Turn Off the Engine
Make sure the car is completely off and the key is removed.
Step 2: Locate the Battery
Open the hood and find the battery. In the Subaru Crosstrek, it’s on the right side (passenger side) of the engine bay.
Step 3: Disconnect the Negative Terminal
Use a wrench to loosen the nut on the negative (black) battery cable. Remove the cable and tuck it away from the terminal so it doesn’t accidentally reconnect.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU to fully reset.
Step 5: Reconnect the Battery
Reattach the negative cable and tighten the nut securely.
Step 6: Start the Car
Turn on the ignition and check if the engine light is off.
Risks and Downsides
– May not clear all codes on newer models
– Can reset radio presets, clock, and seat memory
– May require relearning of adaptive transmission settings
– Doesn’t address the root cause of the problem
When to Use This Method
Only consider this if:
– You don’t have access to an OBD2 scanner
– You’ve already fixed the issue and just need a quick reset
– You’re troubleshooting and want to rule out electrical glitches
Otherwise, stick with the OBD2 scanner method.
Troubleshooting Common Issues
Even after resetting the engine light, you may run into problems. Here’s how to handle them.
The Light Comes Back On Immediately
If the engine light returns right after resetting, the underlying issue hasn’t been fixed. Use an OBD2 scanner to read the new code and diagnose the problem. Common culprits include:
– Faulty oxygen sensor
– Misfiring cylinder
– EVAP system leak
The Scanner Won’t Connect
If your OBD2 scanner won’t communicate with the car:
– Make sure the ignition is on (but engine off)
– Check that the scanner is fully plugged in
– Try a different scanner or port
– Ensure the scanner is compatible with Subaru vehicles
The Light Flashes Instead of Staying Solid
A flashing engine light indicates a severe problem—usually a misfire that can damage the catalytic converter. Stop driving immediately and have the car towed to a mechanic.
No Codes Are Found
If the scanner shows “No Codes” but the light is on, the issue might be:
– A pending code that hasn’t triggered yet
– A problem with the light itself (rare)
– A manufacturer-specific code not readable by basic scanners
In this case, visit a Subaru dealership or use a professional-grade scanner.
Preventing Future Engine Light Warnings
The best way to avoid resetting the engine light is to prevent it from coming on in the first place. Here are some tips to keep your Subaru Crosstrek running smoothly:
1. Perform Regular Maintenance
Follow the maintenance schedule in your owner’s manual. This includes:
– Oil changes every 6,000–7,500 miles
– Air filter replacement every 15,000–30,000 miles
– Spark plug replacement every 60,000–100,000 miles (depending on model)
2. Use Quality Fuel
Fill up at reputable gas stations. Low-quality or contaminated fuel can trigger sensor errors and reduce engine performance.
3. Check the Gas Cap
After every fill-up, make sure the gas cap is tight. A loose cap is one of the most common causes of the engine light.
4. Keep Sensors Clean
Dirt and debris can affect sensors like the MAF and O2 sensors. Clean them periodically with approved cleaners.
5. Address Issues Promptly
Don’t ignore warning lights. The sooner you diagnose and fix a problem, the less damage it can cause.
When to See a Mechanic
While many engine light issues can be handled at home, some require professional help. Visit a Subaru-certified technician if:
– The light is flashing
– You’re unsure how to interpret trouble codes
– The problem involves the transmission, fuel system, or emissions
– You’ve tried resetting the light multiple times and it keeps returning
A mechanic can perform advanced diagnostics, replace complex components, and ensure your Crosstrek meets emissions standards.
Conclusion
Resetting the engine light on your Subaru Crosstrek is a manageable task—especially when you have the right tools and knowledge. Whether you let the system self-correct through driving cycles, use an OBD2 scanner for precise control, or (as a last resort) disconnect the battery, the key is to always address the underlying issue first.
Remember: the engine light is your car’s way of communicating. Ignoring it can lead to bigger problems down the road. But by following the steps in this guide, you can reset the light confidently, keep your Crosstrek in top condition, and enjoy peace of mind on every drive.
Invest in a basic OBD2 scanner, stay on top of maintenance, and don’t hesitate to seek professional help when needed. With these habits, you’ll spend less time worrying about warning lights and more time enjoying the open road.