how to diagnose a P0301 code on my Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down if it has been running.

2. Replace Spark Plug

1. Remove the ignition coil by unbolting it from its mount and disconnecting the electrical connector.
2. Use a spark plug socket to remove the spark plug from cylinder 1.
3. Inspect the removed spark plug for wear or damage; replace it if necessary.
4. Install a new spark plug (ensure proper gap as per manufacturer specifications) and torque it to the recommended value (typically 13-15 ft-lbs).
5. Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

1. Use a multimeter to measure the resistance of the ignition coil; check against manufacturer specifications.
2. If out of range, replace the ignition coil with a new one.
3. Reinstall the ignition coil (if replaced) and reconnect it.

4. Inspect Fuel Injector

1. Locate the fuel injector for cylinder 1 and disconnect the electrical connector.
2. Use a fuel injector cleaner or replace the injector if clogged.
3. Reconnect the electrical connector after cleaning or replacing.

5. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine and note the compression reading; it should be within manufacturer specifications.
4. If the compression is low, further investigation into the cylinder head or piston rings may be required.