how to fix P0171 code in Ford F-150 14th Generation (2021-2024)

• •Check engine light illuminated
• •Rough idle or stalling
• •Decreased fuel efficiency
• •Poor acceleration or power loss
• •Excessive engine noise or backfiring
• •Increased emissions

1. 1Scan for error codes using an OBD-II scanner to confirm P0171 and check for any additional codes.
2. 2Inspect the air intake system for vacuum leaks, including hoses, gaskets, and the intake manifold.
3. 3Check the Mass Air Flow (MAF) sensor for dirt or malfunction by cleaning or testing its output.
4. 4Examine fuel delivery components such as the fuel pump, filter, and injectors for proper operation.
5. 5Inspect the oxygen sensor operation and ensure it is functioning correctly.
6. 6Verify engine coolant temperature sensor readings to ensure it is providing accurate data to the ECU.

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

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

• •OBD-II scanner
• •Vacuum gauge
• •Fuel pressure gauge
• •MAF cleaner
• •Common hand tools (screwdrivers, wrench set, etc.)

• •Replacement vacuum hoses (if necessary)
• •MAF sensor (if replacement is needed)
• •Fuel filter (if clogged)
• •Oxygen sensor (if faulty)