how to troubleshoot P0174 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair process.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses attached to the intake manifold.
  2. Use a smoke machine or carburetor cleaner to identify leaks while the engine is running.
  3. Replace any damaged or cracked hoses.

Tools Required: Smoke machine or carburetor cleaner, pliers.

3. Clean the MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor along the air intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Spray MAF sensor cleaner on the sensing elements and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

Tools Required: MAF sensor cleaner, screwdriver.

4. Fuel System Inspection

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (without starting the engine) to check fuel pressure; it should meet the manufacturer's specifications.
  3. If pressure is low, inspect the fuel pump and replace the fuel filter if needed.

Tools Required: Fuel pressure gauge, socket set.

5. Oxygen Sensor Check

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors on bank 2.
  2. Use a multimeter to test the voltage output of the sensors; it should fluctuate between 0.1 to 0.9 volts.
  3. Replace any sensors that are not functioning properly.

Tools Required: Multimeter, O2 sensor socket.