my Toyota RAV4 XA50 (2019-2024) has a P0303 code what does it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool down.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, pliers.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 3.
• Remove the ignition coil using a socket set.
• Inspect the spark plug for wear or damage; replace if worn.
• Install the new spark plug (torque to specifications, usually 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool, torque wrench.
• Disconnect the fuel injector connector for cylinder 3.
• Remove the fuel rail if necessary to access the injector.
• Remove the fuel injector from the rail.
• Inspect the injector for clogs or damage; replace if needed.
• Reinstall the fuel injector and reattach the fuel rail, securing it to specifications.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 3.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and record the compression reading.
• Compare the reading to manufacturer specifications (typically 180-200 psi).
• If low, further investigation of the cylinder's mechanical components may be needed.