what does it mean when my Ford Mustang S550 (2015-2023) has a P0301 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary (Torque to manufacturer’s specifications, typically around 13 lb-ft).
• Install a new spark plug if needed, ensuring proper gap is set.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil for resistance using a multimeter (compare readings to manufacturer specifications).
• Replace the ignition coil if it fails the test.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Remove the fuel injector connector for cylinder 1.
• Use a noid light to check for injector pulse while cranking the engine.
• If the injector is not functioning, replace it and ensure it is properly seated and connected.

5. Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• If compression is low, inspect for issues such as valve problems or head gasket failure.
• Address any internal engine issues as necessary.