why does my Ford F-150 13th Generation (2015-2020) have a check engine light on

Ford F-150 13th Generation (2015-2020)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

543 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine and exhaust components to cool before servicing.

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Decreased fuel efficiency
•Unusual engine noises (knocking, pinging)
•Failed emissions test
•Increased exhaust emissions (smoke or odor)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify the specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as a loose cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within normal ranges.
4
Inspect the air filter for dirt or clogs that may affect airflow to the engine.
5
Examine the exhaust system for leaks or blockages that could cause emissions issues.
6
Test the battery and charging system to rule out electrical problems affecting engine performance.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Oxygen sensor socket
•Spark plug socket
•Torque wrench

Parts Required

•Oxygen sensor (if needed)
•Spark plugs (if needed)
•Ignition coils (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify the specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as a loose cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within normal ranges.
4
Inspect the air filter for dirt or clogs that may affect airflow to the engine.
5
Examine the exhaust system for leaks or blockages that could cause emissions issues.
6
Test the battery and charging system to rule out electrical problems affecting engine performance.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface.
Disconnect the negative battery terminal to prevent electrical shorts.
Gather tools and parts needed for the repair.

2. Address Trouble Codes

Step 1: Use the OBD-II scanner to read and record the trouble codes.
Step 2: Research the codes to determine the affected systems and components.
Step 3: Clear the codes with the scanner and see if they return after a test drive.

3. Inspect and Repair Faulty Components

Step 1: If codes indicate a faulty oxygen sensor, locate the sensor in the exhaust system.
- Tool Required: Oxygen sensor socket.
- Safety Warning: Allow the exhaust system to cool before working on it.
Step 2: Remove the faulty sensor and install the new one, tightening to manufacturer's specifications.
Step 3: If a misfire code is present, check the spark plugs and ignition coils.
- Tool Required: Spark plug socket and torque wrench.
- Sub-steps:
  - Remove the ignition coils and inspect for damage.
  - Replace any faulty coils and install new spark plugs, torquing them to 13 lb-ft.

4. Reassemble and Test

Reconnect the negative battery terminal.
Start the engine and monitor for any unusual noises or check engine light re-illumination.