how to fix P0171 code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle battery to ensure safety.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Fuel pressure gauge
• MAF sensor cleaner

2. Inspect and Repair Vacuum Leaks

1. Visual Inspection: Check all vacuum hoses for cracks or disconnections.
2. Smoke Test: If necessary, perform a smoke test to find hidden leaks.
3. Replace Damaged Hoses: Replace any damaged hoses or gaskets found during the inspection.

3. Clean or Replace MAF Sensor

1. Remove MAF Sensor: Disconnect the electrical connector and remove the MAF sensor using a socket set.
2. Clean MAF Sensor: Use MAF sensor cleaner to gently clean the sensor; allow it to dry fully.
3. Reinstall: Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

1. Fuel Pressure Test: Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine) to check pressure.
   • Specification: Ensure the pressure is within manufacturer specifications (usually around 40-50 psi).
2. Inspect Fuel Filter: If the pressure is low, check and replace the fuel filter if necessary.
3. Inspect Fuel Pump: If the filter is fine, test the fuel pump operation and replace if faulty.

5. Oxygen Sensor Check

1. Visual Inspection: Check the wiring and connector to the oxygen sensor for damage.
2. Test Sensor Function: Use a multimeter to check the signal output from the sensor during operation; replace if readings are outside the normal range.