my Ram 1500 DT (2019-Present) has a check engine light with code P0171, how to fix?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery negative terminal to ensure safety.
• Allow the engine to cool down if it has been running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the air intake duct and visually inspect for cracks or loose fittings.
  • Tighten or replace any loose or damaged clamps and hoses.
  • If necessary, replace the air intake duct or hose.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  • Locate the MAF sensor, which is typically found in the air intake path.
  • Disconnect the electrical connector from the MAF sensor.
  • Carefully remove the MAF sensor using the appropriate socket or screwdriver.
  • Clean the MAF sensor with MAF sensor cleaner and allow it to dry.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect and Repair Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum lines for any signs of wear, cracks, or disconnections.
  • Replace any damaged vacuum lines with new ones of the same diameter and length.
  • Ensure all connections are secure.

5. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  • Locate the fuel rail and connect the fuel pressure gauge to the test port.
  • Turn the ignition key to the ON position (do not start the engine) to activate the fuel pump and check the pressure.
  • Compare the reading to the manufacturer's specifications. If it is low, consider replacing the fuel pump or filter.