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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge
• Sub-steps:
  1. Remove the air intake duct and inspect for cracks or disconnections.
  2. Check the air filter; replace if dirty.
  3. Reconnect any loose hoses or clamps and ensure a tight fit.

3. Test and Clean MAF Sensor

• Tools Required: MAF sensor cleaner or electrical cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray MAF cleaner on the sensor elements; avoid touching them.
  4. Allow it to dry completely before reinstalling.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail Schrader valve.
  2. Turn the ignition to the ON position without starting the engine and check the pressure reading.
  3. If pressure is below specifications, inspect the fuel pump, filter, and regulator.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, torque wrench
• Sub-steps:
  1. Locate the Bank 2 oxygen sensor (usually downstream of the catalytic converter).
  2. Disconnect the electrical connector.
  3. Use the O2 sensor socket to remove the old sensor.
  4. Install the new sensor and torque it to the manufacturer's specifications (usually around 30 ft-lbs).
  5. Reconnect the electrical connector.