how to troubleshoot P0171 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and securely supported if lifting is required.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks, breaks, or disconnections.
  • Use a smoke machine or carburetor cleaner to identify leaks while the engine is running.
  • Replace any damaged hoses or gaskets.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the air intake tube.
  • Disconnect the electrical connector and remove the sensor.
  • Use MAF sensor cleaner to spray the sensor elements; do not touch them.
  • Reinstall the sensor and reconnect the electrical connector. If damaged, replace with a new MAF sensor.

4. Check Fuel Pressure

• Sub-steps:
  • Locate the fuel pressure test port on the fuel rail.
  • Attach a fuel pressure gauge and turn the ignition on (without starting the engine) to check pressure readings.
  • If pressure is low, check the fuel pump, filter, and relay for issues; repair or replace as necessary.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel injector connectors and use a multimeter to check for resistance; compare with manufacturer specifications.
  • If injectors are clogged, use a fuel injector cleaner or remove and clean them.
  • Reinstall or replace any faulty injectors.