why does my Toyota Highlander’s engine light come on when I accelerate?

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 battery to ensure safety during electrical repairs.

2. Address Diagnostic Trouble Codes (DTCs)

• After retrieving DTCs from the OBD-II scanner, identify the specific codes.
• Research the codes to understand the underlying issues (e.g., P0300 for random misfire).

3. Repair or Replace Affected Components

• If a misfire code is present:
  • Ignition System: Replace faulty spark plugs and ignition coils.
  • Fuel System: Replace clogged fuel injectors or a failing fuel pump.
• If the air intake is blocked:
  • Inspect and clean the air filter; replace if necessary.
  • Check for leaks in the intake manifold and replace gaskets if needed.

4. Reassemble and Reconnect

• Reinstall any components that were removed during inspection.
• Reconnect the battery and ensure all connections are secure.

5. Clear Error Codes

• Use the OBD-II scanner to clear the error codes from the vehicle's computer.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Screwdrivers
• Multimeter

Parts Required:

• Spark plugs
• Ignition coils
• Fuel filter
• Air filter
• Fuel injectors (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before performing any repairs to prevent burns.