what does it mean if my Ford Mustang S550 (2015-2023) has a check engine light and P0301 code

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a level surface and the engine is cool.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, vacuum gauge.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using a socket set.
• Inspect the spark plug for wear, damage, or fouling.
• Replace the spark plug with a new one, ensuring the gap is set to manufacturer specifications.
• Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Use a multimeter to test the resistance of the ignition coil.
• If the resistance is out of specification, replace the ignition coil with a new one.
• Follow the same removal and installation procedure as for the spark plug.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to check the injector's resistance.
• If the readings are not within specifications, replace the fuel injector.
• Reconnect the fuel injector and ensure all connections are secure.

5. Compression Test

• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and record the pressure reading.
• If compression is low, further diagnosis of the internal engine components may be necessary.