how to diagnose P0301 code on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if necessary.
• Remove the spark plug wire or ignition coil for cylinder 1.
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for fouling or damage; replace it if necessary.
• Install a new spark plug, applying dielectric grease to the boot.
• Torque the spark plug to the manufacturer's specification (usually around 13-15 lb-ft).

3. Test and Replace Ignition Coil

• Tools Required: Socket set, multimeter (if applicable).
• If misfire persists, remove the ignition coil from cylinder 1.
• Test the ignition coil with a multimeter, checking for proper resistance as per manufacturer specs.
• If faulty, replace the ignition coil with a new one and reconnect.

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool, O-ring lubricant.
• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel rail (if necessary) and take out the fuel injector.
• Inspect the injector for clogs and electrical connections. Clean or replace as needed.
• Reinstall the injector with new O-rings lubricated with engine oil.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge and crank the engine for a few seconds.
• Record the compression reading and compare it to specifications (typically 120-200 psi).
• If the reading is low, further internal engine diagnostics may be required.