how to fix P0300 random misfire code on Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before working on it.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover if applicable.
• Disconnect the ignition coil connectors and remove the coils using a socket wrench.
• Remove the spark plugs with a spark plug socket and inspect them for wear or damage.
• Replace any faulty spark plugs with new ones, ensuring the gap is set to manufacturer specifications.
• Reinstall the ignition coils and reconnect the connectors.

3. Check and Replace Ignition Coils

• If spark plugs are fine, test each ignition coil with a multimeter according to specifications.
• If any coil is faulty, remove the coil and replace it with a new one.
• Reinstall all ignition coils after replacement.

4. Fuel System Inspection

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position (do not start) and check the pressure reading.
• If the pressure is low, inspect the fuel pump and filter, replacing them as necessary.

5. Air Intake and Vacuum Line Inspection

• Inspect the air intake system for any cracks or loose connections.
• Check all vacuum hoses for leaks or damage; replace any faulty hoses.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0300 code and any other codes.