how to fix P0301 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the spark plug wire from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug and torque to the manufacturer's specification (typically around 13-15 ft-lbs).

3. Check and Replace Ignition Coil

• Tools Required: Socket set.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the mounting bolts using a socket.
• Replace the ignition coil with a new one.
• Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), socket set.
• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector from the rail.
• Clean the injector using a fuel injector cleaning kit or replace it if cleaning isn't effective.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading; compare it to manufacturer specifications.
• If compression is low, further investigation is required for potential internal engine issues.