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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Remove any engine covers if necessary for access.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the spark plug wire or ignition coil from cylinder 1.
• Use a spark plug socket to carefully remove the spark plug.
• Inspect the spark plug for wear; if damaged, replace it with a new spark plug of the manufacturer’s specifications.
• Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).
• Reconnect the ignition coil or spark plug wire.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set.
• Disconnect the ignition coil connector from cylinder 1.
• Use a multimeter to measure the resistance of the ignition coil.
• If the resistance is out of specification, replace the ignition coil with a new one.
• Reconnect the ignition coil and the connector.

4. Inspect Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Remove the fuel injector for cylinder 1.
• Clean the injector using fuel injector cleaner or replace it if it is clogged or faulty.
• Reinstall the fuel injector and ensure all connections are secure.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine to take a compression reading.
• Compare the reading to the manufacturer's specifications; if low, further investigation into piston rings or valves is needed.