how to fix P0174 lean code on Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down.

2. Inspect Air Intake System

• Sub-steps:
  • Visually examine all air intake hoses for cracks or loose connections.
  • Remove and inspect the air filter for cleanliness and proper fit.
  • Replace any damaged hoses or gaskets as necessary.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the "ON" position without starting the engine to check pressure.
  • Compare the reading to manufacturer specifications (typically around 40-50 psi).
  • If pressure is low, check the fuel pump and fuel filter for issues.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Spray MAF cleaner on the sensor elements and let it dry before reinstallation.
  • Reinstall the sensor and reconnect the electrical connector.

5. Inspect and Test PCV System

• Sub-steps:
  • Locate the PCV valve and remove it from the valve cover.
  • Shake the valve; it should rattle if functioning properly. If it doesn’t, replace it.
  • Check the PCV hose for cracks or blockages and replace if necessary.

6. Replace Oxygen Sensors (if necessary)

• Sub-steps:
  • Identify the location of the bank 2 oxygen sensor using a repair manual.
  • Disconnect the electrical connector and remove the sensor using an oxygen sensor socket.
  • Install the new oxygen sensor and reconnect the electrical connector.