how to fix P0174 in my Ram 1500 DT (2019-Present)

Learn how to diagnose and fix P0174 engine running too lean issue in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps and replace damaged hoses as necessary.
  3. Ensure that the air filter is clean and properly installed.

3. Test and Clean MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Sub-steps:
  1. Carefully remove the MAF sensor from the air intake duct.
  2. Spray MAF cleaner onto the sensor element (do not touch it with fingers).
  3. Allow the sensor to dry completely before reinstalling.
  4. Reinstall the MAF sensor and ensure it is secured properly.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition on (do not start the engine) and record the pressure reading.
  3. If the pressure is below specifications, check the fuel pump and fuel filter for issues.
  4. Replace or repair components as needed to meet the required fuel pressure.

5. Inspect Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the oxygen sensors on bank 2 (usually before and after the catalytic converter).
  2. Use a multimeter to test the voltage output of the sensors; they should fluctuate between 0.1-0.9 volts.
  3. Replace any faulty oxygen sensors.