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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Raise the vehicle and secure it with jack stands if necessary.

2. Inspect and Replace Spark Plug

• Remove the ignition coil and spark plug for cylinder 2.
• Inspect the spark plug for wear and carbon buildup. Replace if necessary.
• Torque the new spark plug to the manufacturer’s specifications (typically 13-16 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil

• Use a multimeter to check the resistance of the ignition coil. Replace if out of specification.
• Install the new ignition coil, ensuring it is seated correctly.

4. Inspect and Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for signal to the injector. If no signal, trace wiring back to the ECM.
• If the injector is faulty, remove it and replace it with a new unit. Ensure proper sealing and install as per specifications.

5. Compression Test

• If misfire persists, perform a compression test on cylinder 2.
• If the compression is low, further investigate for possible internal engine issues (valves or piston rings).

6. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold.
• If leaks are found, replace any damaged hoses and retest the system.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Compression tester
• Noid light

Parts Required:

• Spark plug for cylinder 2
• Ignition coil for cylinder 2
• Fuel injector for cylinder 2 (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on the ignition system.
• Allow the engine to cool before performing any work on the engine components.