how to diagnose P0302 misfire code on Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil.
• Unscrew and remove the spark plug using a spark plug socket.
• Install a new spark plug, ensuring it is gapped correctly (typically 0.043 inches for this model).
• Torque the spark plug to the manufacturer’s specification (usually around 13 ft-lbs).

3. Test and Replace Ignition Coil

• Reconnect the ignition coil and connector.
• If the ignition coil is faulty, remove it and replace it with a new one.
• Torque the ignition coil mounting screws to the manufacturer's specification (generally around 7 ft-lbs).

4. Inspect and Clean Fuel Injector

• If the fuel injector is suspected to be clogged, remove it from the engine.
• Use a fuel injector cleaning kit or take the injector to a professional for cleaning.
• Reinstall the fuel injector, ensuring proper alignment and secure connections.

5. Conduct Compression Test (if necessary)

• Reconnect the battery and prepare the compression tester.
• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (typically around 180 psi).
• If the compression is low, further diagnosis for internal engine issues may be required.