what causes my Toyota Camry to misfire and show P0302 code

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unplug the electrical connector.
  • Remove the mounting bolts using a socket set.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for signs of damage or wear.
• Install a new spark plug, ensuring it is gapped correctly (typically 0.043 inches for most Camry models).
• Torque the spark plug to the manufacturer’s specifications (usually around 13 ft-lbs).

3. Replace Ignition Coil (if necessary)

• If the ignition coil is faulty, replace it:
  • Remove the old ignition coil after taking out the mounting bolts.
  • Install the new ignition coil in reverse order of removal.
  • Ensure the connections are secure.

4. Clean or Replace Fuel Injector (if necessary)

• If the fuel injector is clogged, clean it using a fuel injector cleaning kit or replace it:
  • Disconnect the fuel line (use appropriate safety measures to avoid fuel spray).
  • Remove the fuel injector and inspect the O-rings for damage.
  • If cleaning, follow the instructions provided with the cleaning kit. If replacing, install the new injector with new O-rings.

5. Reassemble and Test

• Reconnect any electrical connectors and components that were removed.
• Reconnect the negative battery terminal.
• Start the engine and let it idle to check for misfires.