how to fix P0301 misfire code in Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the spark plug using a spark plug socket.
• Check the spark plug gap and replace the spark plug if worn or fouled.
• Install the new spark plug by hand, then torque to the manufacturer's specification (typically around 13-15 lb-ft).
• Reattach the ignition coil and connect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug was in good condition, inspect the ignition coil.
• Tools Required: Socket set
• Remove the ignition coil from cylinder 1 as described above.
• Check for any visible cracks or damage.
• If damaged, replace the ignition coil with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector harness for cylinder 1.
• Use a noid light or multimeter to check for voltage when the engine is cranked.
• If no voltage is present, troubleshoot wiring issues; if voltage is present, consider replacing the fuel injector.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications (typically around 150-200 psi).
• If the compression is low, further internal engine diagnosis may be required (valve issues, piston rings, etc.).