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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool before beginning work.

2. Inspect Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for any cracks or disconnections.
  • Use a smoke machine or carburetor cleaner around the intake area while the engine is running to detect leaks.
• Tools Required: Smoke machine or carburetor cleaner.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Use MAF sensor cleaner to clean the sensor elements carefully.
  • Reinstall the MAF sensor ensuring it is secured properly.
• Tools Required: Torx or socket set, MAF sensor cleaner.

4. Inspect Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail and turn the ignition key to the "ON" position without starting the engine to check pressure.
  • If pressure is below specifications, check the fuel pump and fuel filter.
  • Check each fuel injector for proper operation and cleaning if necessary.
• Tools Required: Fuel pressure gauge, multimeter (for injector testing).

5. Repair Exhaust Leaks

• Sub-steps:
  • Inspect the exhaust manifold and connections for any signs of leaks.
  • Use an exhaust leak detector or listen for hissing sounds while the engine is running.
  • Repair or replace any leaking exhaust components.
• Tools Required: Exhaust pipe wrench, gasket sealant.