how to fix Ram 1500 DT (2019-Present) P0171 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on the electrical system.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the air intake duct by loosening the clamps with a socket set.
  2. Visually inspect for cracks or damage to the duct and replace if necessary.
  3. Reinstall the duct securely and ensure all connections are tight.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake manifold.
  3. Clean the sensor using MAF cleaner, ensuring not to touch the sensor elements.
  4. Allow the sensor to dry completely before reinstalling.
  5. Reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the ON position (do not start the engine) and check the fuel pressure.
  3. If the pressure is below specifications, check the fuel pump and filter for clogs or failures.
  4. Inspect and clean the fuel injectors if necessary.

5. Inspect Vacuum Hoses

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Replace any cracked or disconnected hoses.
  3. Ensure all hose connections are secure.

6. Test Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream oxygen sensor (pre-catalytic converter).
  2. Use a multimeter to measure the voltage output while the engine is running.
  3. If the voltage does not fluctuate between 0.1V and 0.9V, consider replacing the sensor.