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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, flashlight
• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Inspect the intake hose for cracks or leaks; replace if damaged.
  3. Ensure all clamps are secure and tighten if necessary.
  4. Reinstall the engine cover and reconnect the battery terminal.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Sub-steps:
  1. Locate the MAF sensor, typically found between the air filter and the throttle body.
  2. Carefully disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing using the screwdriver set.
  4. Spray the MAF sensor with MAF cleaner and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect and Test Fuel System

• Tools Required: Fuel pressure gauge, socket set, multimeter
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure; it should be within manufacturer specifications.
  3. If pressure is low, check the fuel pump operation and replace the fuel filter if clogged.
  4. Test the fuel pump relay and fuses using a multimeter; replace any faulty components.

5. Inspect and Test Oxygen Sensors

• Tools Required: OBD-II scanner, multimeter
• Sub-steps:
  1. Use an OBD-II scanner to monitor the oxygen sensor readings while the engine is running.
  2. If readings are inconsistent or out of range, replace the faulty oxygen sensor.
  3. Clear the P0171 code and perform a test drive to confirm the repair.