This guide walks you through how to reset check engine light on 2019 F150 using your truck’s built-in system or an OBD2 scanner. You’ll learn when it’s safe to reset the light and how to avoid common mistakes.
Key Takeaways
- Understand why the light came on: The check engine light can signal anything from a loose gas cap to a serious engine issue. Always diagnose the problem first.
- Use the right tools: A basic OBD2 scanner is the most reliable way to reset the light. Some 2019 F150 models also allow a manual reset using the dashboard controls.
- Don’t ignore the root cause: Resetting the light without fixing the issue will only cause it to return. Always address the underlying problem.
- Drive cycle matters: After resetting, your truck needs to complete a drive cycle so the onboard computer can re-run emissions tests.
- Keep records: Save diagnostic trouble codes (DTCs) before resetting. They help mechanics if further repairs are needed.
- Use genuine parts: After repairs, use OEM or high-quality aftermarket parts to prevent future issues.
- Know when to call a pro: If the light returns quickly or you’re unsure about the diagnosis, consult a certified Ford technician.
How to Reset Check Engine Light on 2019 F150
The check engine light on your 2019 Ford F150 can be alarming—especially if it comes on suddenly. But before you panic, know that this light is simply your truck’s way of saying, “Hey, something needs attention.” Whether it’s a minor issue like a loose gas cap or something more serious like a faulty oxygen sensor, the light is there to protect your engine and emissions system.
In this guide, you’ll learn how to reset check engine light on 2019 F150 safely and effectively. We’ll cover two main methods: using an OBD2 scanner (the most reliable way) and using the truck’s built-in dashboard menu (if available). You’ll also learn when it’s safe to reset the light, what to do before resetting, and how to prevent the light from coming back on.
By the end of this guide, you’ll feel confident handling the check engine light like a pro—no mechanic required. Let’s get started.
Why the Check Engine Light Comes On
Before you reset 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 F150’s onboard diagnostics system (OBD2). This system constantly monitors engine performance, emissions, fuel system, and more.
Common causes include:
- Loose or damaged gas cap: This is the #1 cause of a check engine light. A loose cap allows fuel vapors to escape, triggering the light.
- Faulty oxygen (O2) sensor: These sensors monitor exhaust gases. A bad one can reduce fuel efficiency and increase emissions.
- Catalytic converter issues: A failing converter can cause poor performance and increased emissions.
- Mass airflow (MAF) sensor problems: This sensor measures air entering the engine. If it’s dirty or faulty, your truck may run rough.
- Spark plug or ignition coil failure: Misfires can trigger the light and cause rough idling or poor acceleration.
- Evaporative emissions (EVAP) system leaks: Small leaks in the fuel vapor system can set off the light.
Ignoring the light can lead to reduced fuel economy, engine damage, or even failing an emissions test. So, always diagnose the issue before resetting.
Tools You’ll Need
To reset the check engine light on your 2019 F150, you’ll need one of the following:
- OBD2 scanner: This is the most accurate and recommended tool. You can buy a basic one for $20–$50 online or at auto parts stores. Look for Bluetooth models that work with your smartphone (like the BlueDriver or FIXD scanner).
- Ford dealership or mechanic: If you don’t have a scanner, a professional can reset the light for you—usually for free after repairs.
- Dashboard controls (limited models): Some 2019 F150s with the Sync 3 infotainment system allow a manual reset through the settings menu. We’ll cover this method below.
You’ll also need:
- A working 12V power source (your truck’s battery)
- Access to the OBD2 port (located under the dashboard, near the driver’s side footwell)
- Your truck’s ignition key or push-button start
Step 1: Diagnose the Problem First
Never reset the check engine light without knowing why it came on. Resetting it without fixing the issue is like turning off a smoke alarm while your house is on fire—it doesn’t solve the problem.
Use an OBD2 Scanner to Read Codes
The first step is to read the diagnostic trouble codes (DTCs). These codes tell you exactly what system or component is causing the issue.
Here’s how:
- Turn off your truck and locate the OBD2 port. It’s usually under the dashboard, near the steering column. It’s a 16-pin connector shaped like a trapezoid.
- Plug your OBD2 scanner into the port. Make sure it’s fully seated.
- Turn the ignition to the “ON” position (but don’t start the engine). This powers the scanner.
- Follow the scanner’s instructions to read the codes. Most scanners will display a code like “P0455” (large EVAP leak) or “P0171” (system too lean).
- Write down the code(s). You can look them up online or use the scanner’s app (if it has one) to get a plain-English explanation.
Example: If you see “P0442,” it likely means a small leak in the EVAP system—often caused by a loose gas cap.
Check the Gas Cap
Before doing anything else, check your gas cap. It’s the easiest and most common fix.
- Turn off the engine and let the truck cool.
- Open the fuel door and unscrew the gas cap.
- Inspect it for cracks, wear, or a damaged seal.
- Reinstall it firmly—turn it until you hear 3–4 clicks.
- Drive for 50–100 miles. If the light was due to a loose cap, it should turn off on its own.
If the light stays on, move to the next step.
Step 2: Fix the Underlying Issue
Once you know the cause, fix it. Here are common fixes based on typical codes:
P0455 or P0442 (EVAP Leak)
- Replace the gas cap with a new OEM or high-quality aftermarket cap.
- Inspect EVAP hoses for cracks or loose connections.
- Use a smoke test (at a shop) to find small leaks.
P0133 or P0153 (O2 Sensor Slow Response)
- Replace the faulty oxygen sensor. The 2019 F150 has multiple O2 sensors—front and rear.
- Use a sensor socket and follow Ford’s torque specs.
P0300–P0308 (Misfire Detected)
- Check spark plugs and ignition coils.
- Replace worn spark plugs (recommended every 60,000–100,000 miles).
- Swap coils to see if the misfire follows the coil (indicating a bad coil).
P0420 or P0430 (Catalyst System Efficiency Below Threshold)
- This often means a failing catalytic converter.
- Check for exhaust leaks or engine misfires first—these can damage the converter.
- Replacement is expensive ($1,000+), so get a professional diagnosis.
After repairs, clear the codes and reset the light.
Step 3: Reset the Check Engine Light
Now that the issue is fixed, it’s time to reset the light. You have two options: using an OBD2 scanner or using the dashboard menu (if available).
Method 1: Using an OBD2 Scanner (Recommended)
This is the most reliable and widely used method.
- Plug the scanner into the OBD2 port.
- Turn the ignition to “ON” (engine off).
- Select “Read Codes” to confirm the issue is resolved (codes should be gone or marked as “pending”).
- Choose “Clear Codes” or “Erase DTCs” from the menu.
- Confirm the action when prompted.
- The scanner will display “Codes Cleared” or similar.
- Turn off the ignition and unplug the scanner.
The check engine light should now be off. If it stays off after driving, the reset was successful.
Method 2: Using the Dashboard Menu (Limited Models)
Some 2019 F150s with the Sync 3 system allow a manual reset. This method doesn’t always work for all codes, but it’s worth trying.
- Turn the ignition to “ON” (engine off).
- Press the “Settings” button on the steering wheel or touchscreen.
- Navigate to “Vehicle” > “MyKey” or “Vehicle Settings.”
- Look for “Clear Check Engine Light” or “Reset MIL.” (Note: This option may not appear on all trims.)
- If available, select it and confirm.
- Turn off the ignition.
If the option isn’t there, use the OBD2 scanner method instead.
Step 4: Complete a Drive Cycle
After resetting the light, your F150’s computer needs to re-run its self-tests. This is called a “drive cycle.” Until it completes, the light may not stay off permanently, and you won’t pass an emissions test.
A typical drive cycle for the 2019 F150 includes:
- Start the engine and let it idle for 2–3 minutes (cold start).
- Drive at 30–40 mph for 5 minutes (city driving).
- Accelerate to 55–60 mph and maintain speed for 10 minutes (highway driving).
- Decelerate without braking (coast) for 2 minutes.
- Stop and idle for 2 minutes.
Complete this cycle once or twice. The computer will recheck systems like the O2 sensors, EVAP, and catalytic converter. If all tests pass, the readiness monitors will show “Ready” in your scanner.
If the light comes back on, the issue wasn’t fully resolved. Recheck the codes and repairs.
Tips to Prevent the Light from Coming Back
Once the light is off, keep it that way with these tips:
- Use quality fuel: Stick to Top Tier gasoline to reduce carbon buildup.
- Replace the gas cap properly: Always tighten until it clicks 3–4 times.
- Follow the maintenance schedule: Change oil, spark plugs, and air filters on time.
- Avoid short trips: Frequent cold starts can trigger emissions issues.
- Use OEM parts: Aftermarket sensors and caps may not meet Ford’s specs.
Troubleshooting Common Issues
Even after resetting, you might run into problems. Here’s how to handle them:
Light Comes Back On Immediately
This means the issue wasn’t fixed. Recheck the codes and inspect the related system. For example, if you replaced the gas cap but the light returns, look for EVAP hose leaks.
Scanner Won’t Connect
- Make sure the ignition is on.
- Check the OBD2 port for dirt or damage.
- Try a different scanner or update the firmware.
Dashboard Reset Option Missing
Not all 2019 F150s have this feature. Use an OBD2 scanner instead.
Readiness Monitors Not Completing
Some monitors (like EVAP) need specific conditions to run. Drive in varied conditions—city, highway, cold start—over several days.
When to See a Mechanic
While many issues are DIY-friendly, some require professional help:
- The light flashes (indicates a severe misfire that can damage the catalytic converter).
- You’re unsure about the diagnosis or repair.
- The code points to a complex issue like transmission or fuel pump problems.
- The light returns after multiple resets and repairs.
A certified Ford technician has advanced tools and access to technical service bulletins (TSBs) that may explain your issue.
Conclusion
Resetting the check engine light on your 2019 F150 doesn’t have to be scary. With the right tools and a little know-how, you can diagnose the problem, fix it, and clear the light—all from your driveway.
Remember: always diagnose before you reset. Use an OBD2 scanner to read the codes, fix the root cause, and then clear the light. Complete a drive cycle to ensure the system passes all tests.
By following this guide, you’ll save money, avoid unnecessary trips to the shop, and keep your F150 running smoothly. And the next time that little orange light pops up, you’ll know exactly what to do.