How to Reset Engine Light 2013 Ford Fiesta

Resetting the engine light on a 2013 Ford Fiesta is possible using simple methods like the OBD2 scanner or manual drive cycle. This guide walks you through each option clearly and safely.

Key Takeaways

Understand why the engine light is on: The check engine light can signal minor issues like a loose gas cap or serious problems like engine misfires. Always diagnose first.
Use an OBD2 scanner for accuracy: A scanner reads trouble codes and allows you to reset the light safely without risking further damage.
Manual reset via drive cycle: If you don’t have a scanner, completing a specific driving pattern can reset the light after the issue is fixed.
Never ignore the light: Driving with the engine light on can lead to reduced fuel efficiency, emissions problems, or costly repairs.
Replace faulty parts before resetting: Resetting the light won’t fix the underlying problem. Always repair the issue first.
Battery disconnect is not recommended: Disconnecting the battery may reset the light temporarily but can cause other system errors.
Use quality tools and follow safety steps: Always wear safety gear and work in a well-ventilated area when diagnosing or working under the hood.

How to Reset Engine Light 2013 Ford Fiesta

If you’re driving a 2013 Ford Fiesta and the check engine light suddenly pops up on your dashboard, don’t panic—but don’t ignore it either. That little orange or yellow light is your car’s way of saying, “Hey, something needs attention.” Whether it’s a loose gas cap or a more serious engine issue, knowing how to reset the engine light on your 2013 Ford Fiesta is a valuable skill that can save you time, money, and stress.

In this comprehensive guide, you’ll learn everything you need to know about resetting the engine light on your 2013 Ford Fiesta. We’ll cover why the light comes on, how to diagnose the problem, and the safest and most effective ways to reset it—whether you’re using a professional OBD2 scanner or relying on a manual drive cycle. You’ll also get practical tips, troubleshooting advice, and answers to common questions so you can handle this task with confidence.

By the end of this guide, you’ll be able to reset your engine light the right way—without risking further damage to your vehicle. Let’s get started.

Why Is the Engine Light On?

Visual guide about How to Reset Engine Light 2013 Ford Fiesta

Image source: i.ytimg.com

Before you even think about resetting the engine light, it’s crucial 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). This system constantly monitors your engine, transmission, emissions, and other critical systems.

When a sensor detects a problem—like a drop in fuel pressure, a misfire, or an emissions leak—it sends a signal to the engine control unit (ECU), which then triggers the check engine light.

Common reasons the engine light comes on in a 2013 Ford Fiesta include:

Loose or faulty gas cap: This is one of the most common causes. If the cap isn’t tightened properly, fuel vapors can escape, triggering the light.
Oxygen (O2) sensor failure: These sensors monitor exhaust gases and help regulate fuel mixture. A bad sensor can reduce fuel efficiency.
Mass airflow (MAF) sensor issues: This sensor measures how much air enters the engine. If it’s dirty or faulty, performance drops.
Catalytic converter problems: A failing converter can cause poor acceleration and increased emissions.
Spark plug or ignition coil failure: This leads to engine misfires, rough idling, and reduced power.
Evaporative emissions system leak: A small leak in the fuel vapor system can trigger the light.

The key takeaway? The engine light is a warning, not a suggestion. Ignoring it can lead to decreased fuel economy, increased emissions, and even engine damage over time.

Can You Just Reset the Light Without Fixing the Problem?

Short answer: No—and here’s why.

Resetting the engine light without addressing the underlying issue is like turning off a fire alarm while the house is still on fire. The light may go off temporarily, but the problem remains. In many cases, the light will come back on within a few miles of driving because the OBD2 system continues to monitor the same sensors.

For example, if your gas cap is loose and you reset the light without tightening it, the system will detect the vapor leak again and reactivate the warning. Worse, if the issue is something serious—like a failing catalytic converter—driving with the problem unresolved can cause irreversible damage.

So, always diagnose and fix the problem first. Only then should you reset the engine light.

Tools You’ll Need

Before you begin, gather the right tools. Here’s what you’ll need depending on the method you choose:

OBD2 scanner: This is the most reliable tool for reading and clearing trouble codes. You can buy a basic one for under $20 or rent one from an auto parts store.
Safety gloves and glasses: Protect your hands and eyes, especially if you’re working near the engine.
Owner’s manual: Your 2013 Ford Fiesta manual has useful info about the OBD2 port location and drive cycle procedures.
Clean rag: For wiping down sensors or connectors.
Basic toolkit: Screwdrivers, pliers, or a socket set may be needed to access certain components.

Having the right tools makes the process smoother and safer.

Method 1: Using an OBD2 Scanner (Recommended)

The best and most accurate way to reset the engine light on your 2013 Ford Fiesta is by using an OBD2 scanner. This device plugs into your car’s diagnostic port and communicates with the onboard computer to read trouble codes and clear the light.

Step 1: Locate the OBD2 Port

In the 2013 Ford Fiesta, the OBD2 port is usually located under the dashboard on the driver’s side. You’ll find it near the steering column, about where your knees would be when seated. It’s a 16-pin connector, often covered by a small plastic flap.

To access it:

Sit in the driver’s seat and look down near the pedals.
Gently pull the flap open or remove any covering.
The port should be clearly visible and easy to reach.

Step 2: Plug in the OBD2 Scanner

Turn off the ignition before connecting the scanner. Then:

Insert the scanner’s plug into the OBD2 port.
Make sure it’s fully seated and secure.
Turn the ignition to the “ON” position (but don’t start the engine).

Most scanners will power on automatically when the ignition is on.

Step 3: Read the Trouble Codes

Once the scanner is on:

Press the “Read” or “Scan” button on the device.
Wait a few seconds while it communicates with the car’s computer.
The scanner will display one or more diagnostic trouble codes (DTCs), such as P0455 (large evaporative leak) or P0301 (cylinder 1 misfire).

Write down the codes—you’ll need them to identify the problem.

Step 4: Diagnose and Fix the Issue

Use the codes to determine what’s wrong. You can:

Look up the codes online or in the scanner’s manual.
Take the scanner to an auto parts store—many offer free code reading and basic diagnosis.
Consult a mechanic if the issue is complex.

For example:

If the code is P0455, check the gas cap. Tighten it or replace it if damaged.
If it’s P0171 (system too lean), inspect the MAF sensor or vacuum leaks.
If it’s P0300 (random misfire), check spark plugs and ignition coils.

Fix the issue before proceeding.

Step 5: Clear the Codes and Reset the Light

Once the problem is fixed:

On the scanner, select “Clear Codes” or “Erase DTCs.”
Confirm the action when prompted.
The scanner will send a signal to the ECU to reset the check engine light.
The light should turn off immediately or after a few seconds.

Step 6: Verify the Reset

To make sure the reset worked:

Turn the ignition off and wait 10 seconds.
Turn it back on and check the dashboard.
The engine light should remain off.
Take the car for a short drive (5–10 minutes) to ensure the light doesn’t return.

If the light comes back on, the problem wasn’t fully resolved—or a new issue has appeared.

Method 2: Manual Reset Using a Drive Cycle

If you don’t have an OBD2 scanner, you can try resetting the engine light by completing a specific driving pattern known as a “drive cycle.” This method works because the car’s computer runs self-tests during certain driving conditions. If all tests pass and no faults are detected, the system may automatically clear the codes and turn off the light.

Note: This method only works if the original problem has been fixed. It won’t reset the light if the issue is still present.

Step 1: Ensure the Problem Is Fixed

Before starting the drive cycle, make sure you’ve addressed the cause of the engine light. For example:

Tightened or replaced the gas cap.
Cleaned or replaced a dirty MAF sensor.
Replaced faulty spark plugs.

If you’re unsure, it’s better to use a scanner or visit a mechanic.

Step 2: Perform the Drive Cycle

The 2013 Ford Fiesta requires a specific sequence of driving conditions to complete its self-tests. Here’s a recommended drive cycle:

Start with a cold engine: Let the car sit overnight so the engine is cold (below 120°F).
Drive at 30–40 mph for 3–5 minutes: This warms up the engine and oxygen sensors.
Accelerate to 55–60 mph and maintain speed for 5 minutes: This tests the catalytic converter and emissions system.
Decelerate slowly (without braking hard): Let the car slow down naturally to test deceleration sensors.
Drive in stop-and-go traffic for 10 minutes: This tests idle control and fuel trim.
Repeat the cycle once or twice: Some monitors may require multiple cycles to complete.

The entire process should take about 30–45 minutes.

Step 3: Check the Dashboard

After completing the drive cycle:

Turn off the car and wait 10 minutes.
Start it again and check if the engine light is off.
If it’s still on, the issue may not be fully resolved, or the drive cycle wasn’t completed correctly.

Note: Not all trouble codes can be cleared this way. Some require a scanner.

Method 3: Disconnecting the Battery (Not Recommended)

Some people suggest disconnecting the car battery to reset the engine light. While this can work temporarily, it’s not the best method—and here’s why.

How It Works

When you disconnect the battery, the car’s computer loses power and resets its memory. This can clear stored trouble codes and turn off the engine light.

Steps to Disconnect the Battery

Turn off the ignition and remove the key.
Open the hood and locate the battery (usually on the driver’s side).
Use a wrench to loosen the negative (-) terminal first, then the positive (+).
Remove the negative cable and wait at least 15 minutes.
Reconnect the cable, starting with the positive, then the negative.
Tighten securely and close the hood.

Why This Method Is Risky

Light may return: If the problem isn’t fixed, the light will come back on.
Resets other systems: Disconnecting the battery can reset the radio, clock, power windows, and even the transmission control module.
No diagnostic info: You won’t know what caused the light in the first place.
Potential for error: Reconnecting cables incorrectly can damage electronics.

Only use this method as a last resort—and always fix the issue first.

Troubleshooting Common Issues

Even after following the steps, you might run into problems. Here’s how to handle common issues:

The Light Won’t Turn Off

If the engine light stays on after resetting:

Double-check that the problem was fixed. For example, is the gas cap fully tightened?
Use the OBD2 scanner to see if new codes appear.
Some monitors take time to complete. Drive the car for a few days and see if the light turns off.
If the light flashes, it indicates a severe misfire—stop driving and seek immediate repair.

The Scanner Won’t Connect

If your OBD2 scanner doesn’t power on or connect:

Make sure the ignition is in the “ON” position.
Check the OBD2 port for dirt or damage—clean it gently with a rag.
Try a different scanner or test it on another vehicle.
Ensure the scanner is compatible with your 2013 Ford Fiesta (most are, but older models may not work).

The Drive Cycle Doesn’t Work

If the light remains after the drive cycle:

Ensure the engine was cold when you started.
Follow the speed and time requirements precisely.
Some monitors (like EVAP) require multiple drive cycles over several days.
Use a scanner to check which monitors are “ready” or “not ready.”

Safety Tips and Best Practices

When working on your car, safety should always come first. Follow these tips:

Work in a well-ventilated area: Never work in a closed garage with the engine running.
Wear safety gear: Gloves and glasses protect against burns, cuts, and chemicals.
Let the engine cool: Never touch the engine or exhaust components right after driving.
Use proper tools: Don’t force connections or use damaged equipment.
Keep a fire extinguisher nearby: Especially when working near fuel or batteries.

When to See a Mechanic

While many engine light issues can be handled at home, some problems require professional help. See a mechanic if:

The light is flashing (indicates a severe misfire).
You’re unsure how to fix the issue.
The problem involves the transmission, catalytic converter, or internal engine components.
You’ve tried resetting the light multiple times and it keeps coming back.
Your car is running rough, losing power, or overheating.

A certified Ford technician can perform a full diagnostic and ensure your Fiesta is running safely.

Conclusion

Resetting the engine light on your 2013 Ford Fiesta doesn’t have to be complicated—but it does require the right approach. The key is to diagnose the problem first, fix it properly, and then reset the light using a reliable method like an OBD2 scanner or a complete drive cycle.

Avoid quick fixes like disconnecting the battery, which can cause more harm than good. Instead, take the time to understand what your car is telling you. With the steps in this guide, you’ll be able to reset the engine light safely and confidently, keeping your Fiesta running smoothly for years to come.

Remember: the check engine light is your car’s way of asking for help. Listen to it, address the issue, and reset it the right way.