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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Inspect Hoses: Examine all air intake hoses for cracks or loose connections.
• Repair/Replace: Replace any damaged hoses or secure loose connections.
• Clean MAF Sensor: Use MAF sensor cleaner to spray the sensor element lightly; allow it to dry.

3. Check Fuel System

• Fuel Pressure Test: Connect a fuel pressure gauge to the fuel rail. Turn the ignition to the "ON" position (do not start the engine) and check for adequate fuel pressure (usually around 40-50 PSI).
  • If pressure is low, proceed to replace the fuel filter and check the fuel pump.
• Replace Fuel Filter: If the filter is clogged, use a socket set to remove the filter and replace it with a new one.

4. Test and Replace Engine Coolant Temperature Sensor

• Test Sensor: Use a multimeter to check the resistance of the coolant temperature sensor. Compare values with the manufacturer specifications.
• Replace if Necessary: If the readings are out of spec, remove the old sensor with a socket set and install a new one.

5. Inspect and Replace Oxygen Sensors

• Visual Inspection: Check for any visible damage or corrosion on the oxygen sensors.
• Replacement: If faulty, use an oxygen sensor socket to remove the sensor and install a new one, ensuring proper torque specifications are followed (usually around 30 ft-lbs).