my Ford Explorer Fifth Generation (2011-2019) has a persistent P0301 code what should I check

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using a socket wrench.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear; replace if necessary with OEM or equivalent part.
• Install the new spark plug with a torque specification of 13 lb-ft (17.5 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Test the ignition coil using a multimeter:
  • Check primary resistance (should be between 0.4 - 2.0 ohms).
  • Check secondary resistance (should be between 6,000 - 15,000 ohms).
• If defective, replace the ignition coil with a compatible part.
• Reconnect the ignition coil.

4. Fuel Injector Inspection and Cleaning

• Remove the fuel rail to access the fuel injector for cylinder 1.
• Inspect the injector for clogs or damage.
• If necessary, clean the injector with a suitable cleaning solvent.
• Reinstall the injector and ensure proper sealing.

5. Compression Testing

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications (typically 120-200 psi).
• If compression is low, further investigation into piston rings or valves may be needed.