why does my Honda Accord keep throwing P0171 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Step 1: Visually inspect all vacuum hoses for cracks or disconnections.
• Step 2: Use a smoke machine or carburetor cleaner to identify any hard-to-find leaks.
• Step 3: Replace any damaged vacuum hoses or gaskets.

3. Clean or Replace MAF Sensor

• Step 1: Remove the MAF sensor from the air intake system.
• Step 2: Clean the MAF sensor with MAF sensor cleaner. Allow it to dry completely.
• Step 3: If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Step 1: Connect the fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "ON" position and check the fuel pressure against manufacturer specifications.
• Step 3: If pressure is low, check the fuel pump, fuel filter, and fuel injectors for issues. Replace any faulty components.

5. Inspect Oxygen Sensors

• Step 1: Locate the upstream and downstream oxygen sensors.
• Step 2: Check the wiring and connections for damage or corrosion.
• Step 3: Use a multimeter to test the sensor output; replace any faulty sensors.