how to fix P0301 code in Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required. Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unscrew the mounting bolt using a socket set.
  • Disconnect the electrical connector.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Inspect the spark plug for wear or damage. If necessary, replace it with a new OEM or quality aftermarket spark plug, ensuring the correct gap.

3. Check and Replace Ignition Coil

• After removing the ignition coil, visually inspect it for cracks or signs of overheating.
• If the ignition coil is faulty, replace it with a new one, ensuring proper alignment and secure fitment.
• Reconnect the electrical connector to the ignition coil.

4. Inspect and Test Fuel Injector

• Using a fuel injector tester, perform a functional test on cylinder 1’s fuel injector.
• If the injector is malfunctioning, remove it from the fuel rail:
  • Disconnect the fuel line and electrical connector.
  • Remove the mounting bolts to lift the injector out.
• Replace the faulty injector with a new one, ensuring proper sealing and connection.

5. Compression Test

• If the misfire persists, perform a compression test on cylinder 1:
  • Remove the spark plug and install a compression gauge.
  • Crank the engine and note the reading. Compare it to the manufacturer's specifications.
• If compression is low, further investigation into piston rings or valves may be necessary.

6. Reassemble and Reconnect Battery

• Once all repairs are completed, reinstall any components that were removed.
• Reconnect the negative battery terminal and ensure all connections are secure.