what does the P0301 code mean for my Toyota Highlander XU70 (2020-Present) and how do I fix it?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Needed: Socket set, torque wrench, gap gauge
• Remove the ignition coil cover if necessary.
• Disconnect the ignition coil connector and remove the coil.
• Remove the spark plug using a socket wrench.
• Inspect the spark plug for wear or damage; replace if necessary.
• Set the gap of the new spark plug to manufacturer's specifications.
• Install the new spark plug and torque to the manufacturer's specified value (typically 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil (if needed)

• If the spark plug is functioning correctly, check the ignition coil for cracks or damage.
• Tools Needed: Socket set
• Remove the ignition coil as described above.
• Install a new ignition coil if the old one is found defective.
• Reconnect the ignition coil connector.

4. Check Fuel Injector

• Tools Needed: Fuel pressure gauge, injector cleaner
• Disconnect the fuel injector connector.
• Use a fuel pressure gauge to check for proper fuel pressure at the injector rail.
• If low pressure is detected, inspect the fuel pump and filter.
• If the injector is clogged, use an injector cleaner or replace the injector.

5. Perform Compression Test

• Tools Needed: Compression tester
• Remove the spark plug for Cylinder 1.
• Insert the compression tester and crank the engine several times.
• Compare the compression reading to the manufacturer's specifications.
• If the compression is low, further engine repair may be necessary.