how to fix P0301 misfire code in Ford Mustang S550 (2015-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug.
• Inspect the spark plug for excessive wear or carbon buildup.
• Install a new spark plug (gapping to manufacturer specifications).
• Apply dielectric grease to the boot of the ignition coil and reattach it.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1 (if not replaced during spark plug service).
• Inspect the coil connector for damage.
• Install the new ignition coil and torque it to manufacturer specifications.

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter.
• Connect the fuel pressure gauge to the fuel rail to check for proper fuel pressure.
• If pressure is low, inspect the fuel pump and filter.
• Use a multimeter to test the resistance of the fuel injector; replace if out of specification.
• Clean or replace the fuel injector if necessary.

5. Reassemble and Test

• Reconnect the battery terminal.
• Clear the P0301 code using the OBD-II scanner.
• Start the engine and let it idle to check for any remaining misfires.