what does code P0303 indicate for my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, and basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Ignition Components

• Remove the ignition coil from cylinder 3:
  • Disconnect the electrical connector.
  • Remove bolts using a socket set.
• Inspect the spark plug:
  • Remove the spark plug using a spark plug socket.
  • Check for wear, carbon buildup, or damage; replace if necessary.
• Test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance. Replace if out of spec.

3. Check Fuel Injector

• Remove the fuel injector for cylinder 3:
  • Disconnect the electrical connector and fuel line (use caution, as fuel may spill).
  • Remove the injector retaining clips and pull the injector out.
• Inspect the injector for clogs or damage:
  • Clean or replace the injector as necessary.
• Test the injector operation using a noid light or by connecting it to a test bench.

4. Compression Test

• Perform a compression test on cylinder 3:
  • Remove the spark plug.
  • Insert the compression tester and crank the engine.
  • Record the compression reading and compare it to specifications. Low compression may indicate an internal engine issue.

5. Reassemble and Clear Codes

• Reinstall all components in reverse order of removal.
• Reconnect the battery and clear the P0303 code using the OBD-II scanner.