how to resolve P0302 misfire code Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Unplug the electrical connector.
  • Remove the retaining bolts using a socket set.
  • Pull out the ignition coil.
• Remove the spark plug:
  • Use a spark plug socket to carefully unscrew and remove the spark plug.
  • Inspect the old spark plug for wear or damage.
• Install a new spark plug:
  • Gap the new spark plug to manufacturer specifications (usually around 0.044 inches).
  • Install the new spark plug and torque it to the specified value (typically 13 lb-ft).
• Reinstall the ignition coil:
  • Place the ignition coil back and secure it with the bolts.
  • Reconnect the electrical connector.

3. Replace Fuel Injector (if required)

• If the fuel injector inspection indicated issues, proceed with replacement:
  • Disconnect the fuel line (use caution as fuel may spray).
  • Unplug the electrical connector from the fuel injector.
  • Remove any retaining clips or screws.
  • Pull out the old fuel injector.
• Install the new fuel injector:
  • Apply a small amount of engine oil to the O-ring of the new injector.
  • Insert the new injector and secure it with the retaining clips.
  • Reconnect the electrical connector and fuel line.

4. Clear Codes and Test

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0302 code.
• Start the engine and observe for any check engine light re-illuminating.