how to fix the P0303 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the engine is cool before starting the work.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, gap gauge.
• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector for cylinder 3.
  3. Remove the bolts securing the ignition coil and lift it out.
  4. Remove the spark plug using a spark plug socket. Inspect the old spark plug for wear.
  5. Install a new spark plug, ensuring it is gapped correctly (typically 0.043 inches for Toyota).
  6. Reinstall the ignition coil, securing it with bolts and reconnecting the connector.

3. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if needed), socket set.
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 3.
  2. Remove the fuel rail bolts and carefully pull the fuel rail away, taking care not to damage the injectors.
  3. Remove the fuel injector from the rail and inspect for clogs or damage.
  4. Clean the injector using a fuel injector cleaning kit or replace it if necessary.
  5. Reinstall the injector, ensuring it is seated properly in the rail.

4. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plug from cylinder 3.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the result with manufacturer specifications (typically around 180-200 psi).
  5. If readings are low, further investigation into piston rings or valves may be necessary.