my Ram 1500 DT (2019-Present) has a check engine light with code P0171

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:

  1. Visually inspect the air intake hoses and connections for cracks or looseness.
  2. Replace any damaged hoses or clamps.
  3. Remove the air filter and replace it if dirty or clogged.

• Tools Required:

  • Socket set
  • Screwdriver set

3. Check and Repair Fuel System

• Sub-steps:

  1. Attach the fuel pressure gauge to the fuel rail.
  2. Start the engine and observe the fuel pressure reading; it should be within manufacturer specifications (typically between 55-65 psi).
  3. If the pressure is low, inspect the fuel pump and fuel filter for issues, replacing as necessary.

• Tools Required:

  • Fuel pressure gauge
  • Wrench set

4. Clean or Replace MAF Sensor

• Sub-steps:

  1. Locate the MAF sensor in the air intake duct.
  2. Carefully disconnect the electrical connector and remove the sensor.
  3. Clean the sensor using MAF cleaner; if damaged, replace the sensor with a new one.

• Safety Warnings:

  • Allow the engine to cool before working on the intake system.

5. Inspect Oxygen Sensors

• Sub-steps:

  1. Locate the upstream and downstream oxygen sensors.
  2. Check the wiring and connectors for damage.
  3. Test the sensors using a multimeter; replace any faulty sensors.

• Tools Required:

  • Multimeter
  • O2 sensor socket