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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight
• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or loose fittings.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Use a smoke machine or soapy water to detect any hidden leaks in the system.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, torx driver
• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and remove the sensor from the housing.
  3. Clean the sensor with MAF cleaner according to manufacturer instructions or replace it if damaged.

4. Inspect and Test Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (without starting) and check the pressure. Refer to manufacturer specifications for correct pressure values.
  3. If pressure is low, inspect the fuel pump and fuel filter for blockages or failures.

5. Clean Throttle Body

• Tools Required: Throttle body cleaner, socket set
• Sub-steps:
  1. Remove the air intake duct from the throttle body.
  2. Use throttle body cleaner to clean the inside of the throttle body, removing carbon buildup.
  3. Reinstall the air intake duct securely.

6. Check and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors and remove the sensors using an O2 sensor socket.
  3. Install new sensors, ensuring they are torqued to manufacturer specifications.