how to fix P0171 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
  1. Remove the engine cover (if applicable) using a socket set.
  2. Inspect the air intake hoses and connections for any signs of wear or damage.
  3. Replace any damaged hoses and ensure all clamps are tight.
  4. Reconnect the air intake system and secure it.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
  1. Locate the MAF sensor within the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing using a screwdriver.
  4. Clean the sensor wires with MAF sensor cleaner; do not touch the wires with fingers.
  5. If the sensor is damaged, replace it with a new one.
  6. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the "On" position (without starting the engine) and check the fuel pressure reading. Compare it to manufacturer specifications.
  4. If pressure is low, inspect and replace the fuel filter or fuel pump as necessary.

5. Check for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (if available)
  1. Inspect all vacuum lines connected to the intake manifold.
  2. Use a vacuum gauge to check for proper vacuum; readings should be consistent with manufacturer specifications.
  3. If using a smoke machine, introduce smoke into the intake and check for any escaping smoke that indicates leaks.
  4. Replace any leaking vacuum hoses.

6. Test and Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket
  1. Locate the upstream oxygen sensor (typically before the catalytic converter).
  2. Disconnect the electrical connector from the oxygen sensor.
  3. Use an O2 sensor socket to remove the sensor from the exhaust system.
  4. Install a new oxygen sensor, ensuring to follow torque specifications.
  5. Reconnect the electrical connector.