how to fix P0303 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Spark plug socket
• Compression tester
• Torque wrench
• Basic hand tools (sockets, wrenches, etc.)

2. Replace Spark Plug (if faulty)

1. Remove the engine cover (if applicable) using the appropriate socket.
2. Use the spark plug socket to remove the spark plug from cylinder 3.
3. Inspect the old spark plug for wear or damage.
4. Install a new spark plug, ensuring it is gapped to the manufacturer's specifications (typically around 0.043 inches for Toyota).
5. Torque the spark plug to the specified value (usually around 13 lb-ft).

3. Check and Replace Ignition Coil (if faulty)

1. Disconnect the electrical connector from the ignition coil on cylinder 3.
2. Remove the ignition coil by unscrewing it from the cylinder head.
3. Install a new ignition coil if the old one is determined to be faulty.
4. Reconnect the electrical connector securely.

4. Fuel Injector Service (if faulty)

1. Disconnect the fuel line from the injector rail (use caution for fuel spillage).
2. Remove the fuel injector from cylinder 3 by unscrewing it.
3. Inspect and clean the injector or replace it if necessary.
4. Reinstall the injector and reattach the fuel line securely.

5. Compression Test (if needed)

1. Remove the spark plug from cylinder 3.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. Compare with specifications (typically around 180-200 psi). If low, further investigation may be needed for internal engine issues.