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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector tester, and vacuum gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector and remove the coil from cylinder 2.
3. Use a spark plug socket to remove the old spark plug and inspect it for wear.
4. Install a new spark plug (use OEM specification) and torque it to the manufacturer’s specifications (typically 13-16 lb-ft).
5. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

1. Using a multimeter, test the ignition coil’s primary and secondary resistance according to the service manual.
2. If out of specification, replace the ignition coil with a new one.
3. Reinstall the ignition coil and reconnect the connector.

4. Inspect Fuel Injector

1. Remove the fuel injector connector for cylinder 2.
2. Use a noid light to test for injector pulse; if there is no pulse, the injector may need replacing.
3. If the injector is faulty, remove the fuel rail and replace the fuel injector for cylinder 2 with a new one.
4. Reinstall the fuel rail and reconnect the fuel injector connector.

5. Perform Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole and crank the engine for a few seconds.
3. Record the compression reading and compare it to manufacturer specifications (typically around 180 psi).
4. If compression is low, further diagnosis is needed for mechanical issues like valve or piston damage.