how to fix P0302 misfire code in Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather Tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Safety Warning: Disconnect the negative battery terminal before starting any electrical work.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate cylinder 2 spark plug (usually the second from the timing belt side).
3. Use a socket wrench to remove the spark plug.
4. Inspect the spark plug for signs of wear or fouling.
5. If damaged, replace the spark plug with a new one (use OEM specifications).
6. Torque the new spark plug to the manufacturer’s specifications (typically around 13 ft-lbs).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 2.
2. Remove the mounting bolts using a socket wrench.
3. Pull the ignition coil out of the spark plug well.
4. Inspect the ignition coil for cracks or damage.
5. If defective, replace with a new ignition coil (ensure compatibility with your model).
6. Reinstall the ignition coil and torque the mounting bolts to specifications.

4. Test and Clean Fuel Injector

1. Disconnect the fuel injector connector from cylinder 2.
2. Remove the fuel rail if necessary to access the injector.
3. Use a multimeter to check the resistance of the fuel injector (specifications should be in the service manual).
4. If the injector is faulty, replace it with a new one.
5. If working, use a fuel injector cleaner to clean the injector.
6. Reassemble the fuel rail and reconnect the injector connector.

5. Compression Test (if necessary)

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds to take a reading.
4. Compare the readings to the manufacturer's specifications (typically around 150-200 psi).
5. If compression is low, further investigation into engine internals is necessary.