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

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

512 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 the persistent 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

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.
•Allow the engine to cool before inspecting components to avoid burns.

Symptoms

•Check engine light illuminated
•Reduced engine performance
•Increased fuel consumption
•Occasional rough idling
•Engine stalling during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Review repair history to check what issues were previously addressed and verify if they were resolved.
3
Inspect the condition of the battery and connections for any voltage irregularities.
4
Check for vacuum leaks in hoses and intake manifold.
5
Test the fuel system pressure to ensure it meets manufacturer specifications.
6
Examine the condition and functionality of the oxygen sensors and other emission control components.

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
•Fuel pressure gauge
•Socket set
•Torque wrench

Parts Required

•Vacuum hoses (if damaged)
•Oxygen sensors (if faulty)
•Fuel filter (if blocked)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Review repair history to check what issues were previously addressed and verify if they were resolved.
3
Inspect the condition of the battery and connections for any voltage irregularities.
4
Check for vacuum leaks in hoses and intake manifold.
5
Test the fuel system pressure to ensure it meets manufacturer specifications.
6
Examine the condition and functionality of the oxygen sensors and other emission control components.

Solution

1. Preparation

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

2. Address Fault Codes

Use the OBD-II scanner to retrieve and document the current error codes.
Based on the codes, reference the repair manual for specific diagnostic procedures related to each code.

3. Inspect and Repair Components

Vacuum Leaks:
- Inspect all vacuum hoses for cracks or disconnections.
- Replace any damaged hoses with OEM parts.
Electrical Connections:
- Clean battery terminals and test connections.
- Repair or replace any frayed wires leading to sensors and the ECU.
Oxygen Sensors:
- Remove and inspect oxygen sensors for contamination or damage.
- Replace sensors if they show signs of wear or are not functioning properly.

4. Fuel System Check

Connect a fuel pressure gauge to the fuel rail.
Turn the ignition key to the "ON" position (without starting the engine) to check fuel pressure.
If pressure is low, inspect the fuel pump and filter for blockages or failure, and replace as necessary.

5. Reconnect and Reset

Reconnect the negative battery terminal.
Clear the trouble codes using the OBD-II scanner and perform a test drive to ensure no new codes appear.