how to fix the P0301 misfire code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, fuel injector cleaning kit, torque wrench.
• Disconnect the negative battery terminal to ensure safety.
• Gather all necessary tools and parts before starting.

2. Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil wiring harness on cylinder 1.
• Remove the ignition coil using a socket set and inspect it for damage.
• Remove the spark plug using a spark plug socket. Inspect the spark plug for wear or deposits.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.044 inches).
• Reinstall the ignition coil and reconnect the wiring harness.

3. Test and Replace Ignition Coil (if necessary)

• Use a multimeter to test the ignition coil's resistance. Compare readings to manufacturer specifications.
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the wiring harness.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel injector using a fuel injector removal tool.
• Clean the injector using a fuel injector cleaning kit or replace it if it is clogged or damaged.
• Reinstall the fuel injector ensuring it is seated properly.

5. Conduct Compression Test

• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and read the compression values; compare to manufacturer specifications.
• If compression is low, investigate further for potential mechanical issues such as a blown head gasket or valve problems.