how to fix the P0171 and P0174 lean codes in my Acura MDX YF3 (2022-Present)

Solution

1. Preparation

• Disconnect the battery to ensure safety while working on electrical components.
• Gather necessary tools and parts for repair.

2. Inspect and Repair Air Intake System

• Sub-steps:

  1. Visually inspect all air intake hoses for cracks or loose connections.
  2. Replace any damaged hoses with OEM parts.
  3. Clean or replace the air filter if it is dirty or clogged.

• Tools Required: Basic hand tools, screwdriver set, replacement air filter.

3. Clean or Replace MAF Sensor

• Sub-steps:

  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector.
  3. Remove the sensor by unscrewing it from its housing.
  4. Clean the MAF sensor using MAF cleaner spray. Allow it to dry completely.
  5. If cleaning does not resolve the issue, replace the sensor with a new one.

• Tools Required: MAF cleaner spray, socket set.

4. Check Fuel Pressure

• Sub-steps:

  1. Locate the fuel rail and connect a fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading with manufacturer specifications; typically around 50-60 psi.
  4. If the pressure is low, inspect the fuel pump and replace if necessary.

• Tools Required: Fuel pressure gauge.

5. Inspect Fuel Injectors

• Sub-steps:

  1. Remove the engine cover to access the fuel injectors.
  2. Visually inspect the injectors for leaks and electrical connections.
  3. Use an injector cleaner if clogged, or replace faulty injectors with OEM parts.

• Tools Required: Basic hand tools, injector cleaner, replacement injectors (if needed).