what are the common causes of P0171 code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine.
• Use a vacuum gauge to check for leaks in the intake system. Alternatively, use a smoke machine to identify leaks.
• Repair any damaged hoses or gaskets found during the inspection.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor using MAF cleaner; allow it to dry completely before reinstalling.
• If cleaning does not resolve the issue, replace the MAF sensor.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on without starting the engine and check the fuel pressure reading.
• If the pressure is below specifications (usually between 40-50 psi), inspect the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit.
• Remove the fuel injectors from the fuel rail.
• Use a fuel injector cleaning kit to clean the injectors or replace them if they are clogged or leaking.

6. Test and Replace O2 Sensor if Necessary

• Tools Required: O2 sensor socket.
• Use a multimeter to test the voltage output of the upstream O2 sensor.
• If the sensor is not functioning within the specified range (typically 0.1 to 0.9 volts), replace the O2 sensor.