why does my Toyota RAV4 XA40 (2013-2018) have a check engine light and runs rough

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Ignition System Issues

• Sub-steps:
  • Remove the engine cover if applicable.
  • Inspect and replace spark plugs if they are worn or fouled (Torque to manufacturer specifications, usually around 13 lb-ft).
  • Test ignition coils with a multimeter for proper resistance; replace any faulty coils.
  • Reassemble the ignition components and reconnect the battery.

3. Check and Clean Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail; ensure pressure is within manufacturer specifications.
  • If pressure is low, inspect the fuel pump and fuel filter for any issues, replacing as necessary.
  • Clean fuel injectors using a specialized cleaning kit or replace if clogged.

4. Inspect and Clean Air Intake System

• Sub-steps:
  • Remove the air intake duct and inspect the MAF sensor; clean with MAF cleaner if dirty.
  • Check the air filter and replace if clogged or dirty.
  • Reassemble the air intake system securely.

5. Test Exhaust System

• Sub-steps:
  • Inspect the catalytic converter for signs of damage or blockage.
  • If the catalytic converter is suspected to be faulty, conduct a back pressure test and replace if necessary.