how to diagnose P0301 code in Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Spark Plug Inspection

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 1.
• Unscrew the spark plug using the spark plug socket.
• Inspect the spark plug for wear; replace if it shows significant wear or is fouled.
• If replacing, torque the new spark plug to the manufacturer's specifications (usually around 13-20 lb-ft).

3. Ignition Coil Testing

• Swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2).
• Reconnect the battery and start the engine.
• Observe if the misfire moves to the new cylinder (indicating a faulty coil) or remains on cylinder 1 (indicating a different issue).
• If the ignition coil is faulty, replace it with a new one.

4. Compression Testing

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Install the compression tester and crank the engine.
• Note the reading; it should fall within the manufacturer's specifications (typically around 150-200 psi).
• If compression is low, further investigation into the engine internals may be necessary.

5. Fuel Injector Testing

• Tools Required: Fuel injector tester or multimeter for resistance check.
• Disconnect the fuel injector connector for cylinder 1.
• Test the resistance of the injector; it should match the specifications (typically around 12-16 ohms).
• If the injector is faulty, replace it with a new one.