why does my Ford F-150 have a check engine light with code P0301

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil on cylinder 1 using a socket set.
• Extract the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace if necessary.
• Torque the new spark plug to manufacturer specifications (typically 13-15 lb-ft).
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter.
• If the resistance is out of spec, remove the faulty ignition coil and replace it with a new one.
• Ensure the connection is secure and reassemble the components.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector and check for proper voltage with a multimeter.
• If the voltage is correct, perform a fuel injector flow test.
• If the injector is faulty, replace it with a new one and reconnect the harness.

5. Perform Compression Test

• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and record the compression reading.
• If the compression is below the manufacturer's specifications, further investigation into internal engine components may be necessary.