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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Use smoke testing or a carburetor cleaner spray to identify leaks.
  3. Replace any damaged hoses or seals.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct using a socket set.
  3. Clean the MAF sensor with MAF cleaner spray; do not touch the sensor element.
  4. If the sensor is faulty, replace it with a new one.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel System Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Attach the fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position (do not start) and check the pressure reading.
  4. If the pressure is below manufacturer specifications, inspect or replace the fuel pump and fuel filter.

5. Throttle Body Cleaning

• Sub-steps:
  1. Remove the air intake duct from the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and bore.
  3. Reassemble the air intake duct securely.

6. Check and Replace Oxygen Sensors (if necessary)

• Sub-steps:
  1. Locate the upstream oxygen sensor in the exhaust manifold.
  2. Disconnect the electrical connector and unscrew the sensor using a socket wrench.
  3. Install the new oxygen sensor and reconnect the electrical connector.