how to fix the P0302 misfire code on my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression tester, new spark plugs, new ignition coil (if faulty), new fuel injector (if required).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the engine cover (if applicable) and disconnect the negative battery cable.
• Remove the ignition coil for cylinder 2 by unscrewing it and gently pulling it out.
• Unscrew the spark plug using the socket set and inspect it for wear or damage; replace if necessary.
• Install the new spark plug, tightening it to the manufacturer's specified torque (typically around 13-16 lb-ft).
• Reinstall the ignition coil, ensuring it seats properly.

3. Inspect and Replace Ignition Coil

• If the spark plug inspection revealed no issues, check the ignition coil for proper operation using a multimeter.
  • Measure the resistance and compare with specifications; replace if it’s out of range.
• Install the new ignition coil by reversing the removal steps.

4. Check and Replace Fuel Injector

• If the ignition coil is functioning properly, check the fuel injector for cylinder 2.
• Remove the fuel rail to access the injector and inspect for clogs or leaks.
• Replace the injector if necessary, ensuring that O-rings are in place and seated properly.

5. Verify Compression (if needed)

• If misfire persists, perform a compression test on cylinder 2.
• If compression is low, further investigation into engine internals may be necessary, such as checking valves and piston rings.