why does my Ford F-150 13th Generation (2015-2020) engine light keep coming on

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

556 words

Problem Statement

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

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before performing any inspections or repairs.

Symptoms

•Check engine light illuminated
•Rough idle when starting
•Loss of power during acceleration
•Poor fuel economy
•Unusual engine noises (e.g., knocking or pinging)
•Emissions test failure

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Check fluid levels (engine oil, coolant, transmission fluid) for any deficiencies or contamination.
3
Inspect the gas cap for tightness or damage; a loose cap can trigger the check engine light.
4
Visually inspect engine components such as spark plugs, ignition coils, and wiring for wear or damage.
5
Test the battery and alternator voltage to ensure proper electrical supply to engine components.
6
Perform a smoke test to check for vacuum leaks in the intake system.

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
•Basic hand tools (sockets, wrenches)
•Multimeter
•Smoke machine (if applicable)

Parts Required

•Oxygen sensor (if faulty)
•Spark plugs (if worn)
•Ignition coils (if defective)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Check fluid levels (engine oil, coolant, transmission fluid) for any deficiencies or contamination.
3
Inspect the gas cap for tightness or damage; a loose cap can trigger the check engine light.
4
Visually inspect engine components such as spark plugs, ignition coils, and wiring for wear or damage.
5
Test the battery and alternator voltage to ensure proper electrical supply to engine components.
6
Perform a smoke test to check for vacuum leaks in the intake system.

Solution

1. Preparation

Tools Required: OBD-II scanner, basic hand tools (sockets, wrenches), multimeter, smoke machine (if applicable).
Instructions:
- Disconnect the negative battery terminal to ensure safety while working on electronic components.
- Gather all necessary tools and parts before starting the repair.

2. Address Error Codes

Instructions:
- Use the OBD-II scanner to read and document the error codes.
- Research codes online or refer to a repair manual to determine the specific issues indicated by the codes.

3. Repair Identified Issues

Instructions:
- If the issue is a faulty oxygen sensor:
  1. Locate the sensor using the vehicle service manual.
  2. Disconnect the wiring harness and remove the sensor using an O2 sensor socket.
  3. Install the new oxygen sensor and reconnect the wiring harness.
- If the problem is with ignition coils or spark plugs:
  1. Remove the engine cover if necessary.
  2. Disconnect the electrical connectors from the ignition coils.
  3. Remove the ignition coils and inspect the spark plugs; replace them if worn.
  4. Reinstall new spark plugs and ignition coils, ensuring proper torque specifications are followed.

4. Clear Codes and Reconnect Battery

Instructions:
- Use the OBD-II scanner to clear the error codes after repairs are completed.
- Reconnect the negative battery terminal securely.