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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from cylinder 1.
  3. Remove the ignition coil using a socket wrench.
  4. Inspect the spark plug for wear or damage; replace if necessary.
  5. Install a new spark plug, ensuring it is gapped correctly.
  6. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail if necessary (ensure to relieve fuel pressure prior).
  3. Remove the old fuel injector and install a new one.
  4. Reassemble the fuel rail and reconnect all connectors.

4. Check Compression

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine to measure the compression; compare to specifications.
  4. If compression is low, further investigation of valve operation or piston rings may be necessary.

5. Final Assembly

• Reconnect any components removed during the process.
• Reconnect the negative battery terminal.
• Clear the P0301 code using an OBD-II scanner.