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Home/Cars/Ford/F-150/Fourteenth Generation (2021-present)/why is my Ford F-150 Fourteenth Generation (2021-present) check engine light on

why is my Ford F-150 Fourteenth Generation (2021-present) check engine light on

Ford F-150 Fourteenth Generation (2021-present)

Error Codes
Severity: mediumDifficulty: mediumError Code: P01711-3 hours
3 min read
507 words

Problem Statement

Learn how to diagnose and fix P0171 engine performance issues in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Affected Component
Engine
Estimated Time
1-3 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Rough engine idle
  • •Poor acceleration performance
  • •Decreased fuel efficiency
  • •Unusual noises from the engine compartment
  • •Potential engine stalling

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify specific trouble codes.
  2. 2Check the vehicle’s fuel cap to ensure it is tightly sealed and not damaged.
  3. 3Inspect the engine oil level and quality; low or dirty oil can trigger a check engine light.
  4. 4Examine the air filter for clogging or dirt that may affect airflow to the engine.
  5. 5Inspect wiring and connectors related to the engine control module (ECM) for damage or corrosion.
  6. 6Test the battery voltage and connections; low voltage can affect engine performance.

Solution

Solution

1. Preparation

  • Ensure the vehicle is parked on a level surface.
  • Disconnect the battery's negative terminal for safety.
  • Gather all necessary tools and parts.

2. Addressing Error Codes

  • Sub-step 1: Reconnect the OBD-II scanner and retrieve the error codes.
  • Sub-step 2: Research the specific codes to pinpoint the issue (e.g., P0171 - System Too Lean).

3. Repairing Faulty Components

  • Sub-step 1: If the fuel cap is faulty, replace it with a new OEM part.
  • Sub-step 2: If error codes indicate a misfire or lean condition, check and replace spark plugs and ignition coils as needed.
    • Tools Required: Socket set, torque wrench
    • Torque Values: Refer to the service manual for specific torque settings for spark plugs.

4. Cleaning or Replacing Filters

  • Sub-step 1: Remove the air filter and inspect it for dirt and blockages.
  • Sub-step 2: Clean the air filter if reusable or replace it with a new one.
    • Tools Required: Screwdriver set (if applicable for housing)

5. Final Check

  • Sub-step 1: Reconnect the battery's negative terminal.
  • Sub-step 2: Clear any error codes using the OBD-II scanner.
  • Sub-step 3: Start the engine and observe for any abnormal behavior or lights.

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
  • •Socket set
  • •Torque wrench
  • •Screwdriver set

Parts Required

  • •Replacement fuel cap (if necessary)
  • •Spark plugs (if misfire detected)
  • •Ignition coils (if misfire detected)
  • •Air filter (if dirty or clogged)

Additional Information

Error Code
P0171
Affected Component
Engine
Estimated Time
1-3 hours
Difficulty
medium
Severity
medium
Tools Required
4 items
Parts Required
4 items

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