how to diagnose P0301 misfire code on Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Spark Plug

• Remove the spark plug from cylinder 1 using a socket set.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• Torque the new spark plug to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder 1 after disconnecting the electrical connector.
• Check for cracks or damage on the ignition coil. Replace if damaged.
• Install the new ignition coil, ensuring it seats properly, and reconnect the electrical connector.

4. Inspect Fuel Injector

• Remove the fuel injector from cylinder 1 by detaching its connector and securing clips.
• Use a noid light to check for proper electrical signal at the injector connector.
• Clean or replace the fuel injector if it is clogged or not functioning properly.

5. Check Compression

• Use a compression tester to check the compression of cylinder 1.
• If compression is low, further investigation into piston rings or valves may be necessary.

6. Reassemble and Test

• Reinstall all components in reverse order of removal.
• Reconnect the battery terminal.
• Start the engine and check for any error codes using the OBD-II scanner.