how to fix P0301 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool completely before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket.
  3. Pull the ignition coil out of the spark plug well.
• Remove the spark plug:
  1. Use the spark plug socket to unscrew the spark plug from the cylinder head.
  2. Inspect the spark plug for wear; replace it if necessary (gapping to manufacturer's specification if applicable).
• Install the new spark plug:
  1. Hand-tighten the spark plug, then use the torque wrench to tighten to the manufacturer's specified torque (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug was not the issue, proceed to check the ignition coil:
  1. Remove the ignition coil from cylinder 1 as detailed above.
  2. Test the ignition coil with an ohmmeter for resistance (follow manufacturer specifications).
  3. If the coil is faulty, replace it with a new unit.
• Reinstall the new ignition coil and connect the electrical connector.

4. Check Fuel Injector

• If misfire persists, check the fuel injector:
  1. Disconnect the fuel injector connector.
  2. Use a noid light to check for proper pulse signal to the injector.
  3. If the signal is absent, further electrical diagnostics may be needed.
  4. If the injector is faulty, replace it with a new fuel injector.

5. Compression Test

• If all else fails, perform a compression test:
  1. Remove the spark plug and insert a compression gauge into cylinder 1.
  2. Crank the engine and record the compression reading.
  3. If the reading is below specifications, internal engine issues may be present (e.g., valve or head gasket issues).