how to fix P0171 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect all intake hoses and connections for cracks or loose fittings.
• Replace any damaged hoses or gaskets.
• Reinstall components and ensure they are secured tightly.

3. Check and Replace Fuel Filter (if applicable)

• Tools Required: Socket set, fuel line disconnect tool
• Locate the fuel filter in the fuel line.
• Disconnect the fuel lines using the fuel line disconnect tool and remove the filter.
• Install the new fuel filter, ensuring proper orientation, and reconnect the fuel lines.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (specific for cleaning), Torx or socket set
• Remove the MAF sensor by unscrewing it from the intake duct.
• Clean the sensor gently with MAF cleaner; do not touch the sensor wire.
• Reinstall the sensor securely.

5. Test and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, multimeter
• Locate the upstream and downstream O2 sensors.
• Remove the sensors using an O2 sensor socket.
• Test the sensors with a multimeter. Replace them if they are out of specification.
• Install new sensors, ensuring they are properly torqued to manufacturer specifications.