my Ford F-150 13th Generation (2015-2020) has a check engine light and bad fuel economy

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

489 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix check engine light and poor fuel economy issues in 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 battery before working on electrical systems
•Allow engine to cool before opening any components

Symptoms

•Check engine light illuminated
•Decreased fuel efficiency
•Rough idle
•Engine stalling during acceleration
•Increased emissions
•Unusual engine noises (knocking or pinging)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to retrieve diagnostic trouble codes (DTCs)
2
Inspect the fuel system for leaks or blockages, including the fuel filter and fuel injectors
3
Check the air intake system for obstructions or leaks in the intake manifold and air filter
4
Test the spark plugs and ignition system components for wear or malfunction
5
Evaluate the exhaust system for blockages, especially in the catalytic converter
6
Monitor fuel trim readings to assess if the engine is running rich or lean

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
•Multimeter
•Socket set
•Torque wrench
•Screwdrivers
•Fuel pressure gauge

Parts Required

•Fuel filter
•Spark plugs
•Ignition coils (if necessary)
•Air filter
•Intake manifold gaskets (if necessary)
•Catalytic converter (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to retrieve diagnostic trouble codes (DTCs)
2
Inspect the fuel system for leaks or blockages, including the fuel filter and fuel injectors
3
Check the air intake system for obstructions or leaks in the intake manifold and air filter
4
Test the spark plugs and ignition system components for wear or malfunction
5
Evaluate the exhaust system for blockages, especially in the catalytic converter
6
Monitor fuel trim readings to assess if the engine is running rich or lean

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to prevent electrical shorts.
Allow the engine to cool before starting work.

2. Address Fault Codes

Based on the retrieved DTCs, refer to repair manuals to determine specific component failures.
Clear the fault codes with the OBD-II scanner and take the vehicle for a test drive to see if the codes return.

3. Inspect and Replace Faulty Components

Fuel System:
- Remove the fuel filter and inspect for clogs. Replace if necessary.
- Inspect fuel injectors for proper operation using a multimeter, replace if faulty.
Air Intake System:
- Remove and clean the air filter or replace it if dirty.
- Inspect the intake manifold for leaks; replace gaskets if necessary.
Ignition System:
- Remove spark plugs for inspection; replace if worn or fouled. Torque to manufacturer's specification (typically around 13-15 lb-ft).
- Check ignition coils for proper function and replace if faulty.
Exhaust System:
- Inspect the catalytic converter for blockages or damage, replace if needed.

4. Reassemble and Test

Reinstall any removed components securely.
Reconnect the battery and start the engine.
Monitor the vehicle for any continuing symptoms or illuminated check engine light.