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

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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical shorts during repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, torque wrench, screwdrivers
• Inspect all air intake components for signs of wear or leaks, particularly:
  • Air filter
  • Intake hoses
  • Intake manifold
• Sub-steps:
  1. Remove the air filter and inspect for clogging; replace if necessary.
  2. Tighten or replace any loose or damaged hoses.
  3. Reattach all components securely and check for proper fit.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake.
  3. Spray MAF sensor cleaner onto the sensor elements and allow to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Check

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position (without starting) to check fuel pressure.
  3. Compare the reading with manufacturer specifications; replace the fuel pump or filter if pressure is low.

5. Oxygen Sensor Inspection

• Tools Required: O2 sensor socket
• Sub-steps:
  1. Inspect the wiring and connectors to the oxygen sensors for damage.
  2. Use an O2 sensor socket to remove the sensor from the exhaust system.
  3. Check for contamination; replace if necessary.
  4. Install the new sensor, ensuring the proper torque value is followed (typically around 30 lb-ft).