why does my Toyota Highlander Third Generation (2014-2019) engine light flash when accelerating

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Ignition Components

• Remove the engine cover (if applicable) to access the ignition coils and spark plugs.
• Using a socket set, remove the spark plugs and inspect for wear or damage.
• If damaged, replace the spark plugs with OEM-equivalent parts.
• Check the ignition coils for cracks or corrosion; replace any faulty coils with new ones.
• Reassemble the components and reconnect the battery terminal.

3. Fuel System Check

• Using a fuel pressure gauge, check the fuel pressure at the fuel rail.
• If the pressure is out of specification, inspect the fuel filter and fuel pump for blockages or failures.
• Clean or replace fuel injectors if they are clogged.

4. Air Intake and MAF Sensor Cleaning

• Disconnect the MAF sensor electrical connector and remove the sensor.
• Clean the MAF sensor with MAF sensor cleaner and allow it to dry.
• Inspect the air intake hoses for cracks or leaks and replace if necessary.
• Reinstall the sensor and reconnect the electrical connector.

5. Exhaust and Vacuum Leak Inspection

• Visually inspect the exhaust system for any cracks, holes, or loose connections.
• Use a smoke machine or common household methods (like propane) to identify vacuum leaks around hoses and intake manifold.