how to address P0303 code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 3.
• Remove the ignition coil using a socket wrench.
• Remove the spark plug with a spark plug socket.
• Inspect the spark plug for wear or damage. Replace it if necessary.
• Install a new spark plug and torque it to the manufacturer’s specification (typically around 13-16 lb-ft).
• Reattach the ignition coil and connector.

3. Inspect and Replace Ignition Coil (if needed)

• If the ignition coil shows signs of damage or failure, replace it.
• Install the new ignition coil onto the spark plug and reconnect the electrical connector.
• Ensure it is seated properly and secure.

4. Check and Clean Fuel Injector

• Access the fuel injector for cylinder 3, which may require removing the intake manifold.
• Disconnect the fuel line and electrical connector from the injector.
• Remove the fuel injector and inspect it for clogs or leaks.
• Clean the injector using an appropriate cleaner or replace it if necessary.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Compression Test

• Remove the spark plug from cylinder 3 again.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications. If it is below specs, further engine diagnostics may be necessary.