how to fix P0301 code on my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the engine is cool.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Noid light or fuel injector tester
• Screwdrivers
• Safety glasses

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1:
  • Disconnect the electrical connector.
  • Unbolt the coil using the appropriate socket.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the spark plug.
• Inspect the spark plug for wear (carbon fouling, electrode damage).
• Replace with a new spark plug if necessary:
  • Ensure the gap is set to manufacturer specifications (typically 0.043 inches for Toyota).
  • Install the new spark plug by hand and then torque to manufacturer specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Check the ignition coil for cracks or damage.
• If faulty, replace the ignition coil:
  • Install the new ignition coil, ensuring it’s seated properly.
  • Reconnect the electrical connector and secure it with the bolts.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light or fuel injector tester to check for pulse:
  • If there is no pulse, inspect wiring for damage; if the wiring is intact, replace the injector.
• If the injector is faulty, remove it using a socket wrench.
• Install the new fuel injector and reconnect it.

5. Check for Vacuum Leaks

• Inspect the intake manifold and throttle body gaskets for leaks.
• Use a smoke machine or carburetor cleaner to identify leaks.
• If leaks are found, replace the gaskets or repair the intake manifold as necessary.

6. Perform Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine.
• Note the compression reading; it should be within the manufacturer's specifications (typically around 180 psi).
• If the reading is low, further investigation is needed for potential internal engine issues.