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

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the old spark plug for damage or excessive wear.
• Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer's specification (typically around 13-16 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if applicable)

• If the spark plug is fine, proceed to replace the ignition coil.
• Tools Required: Socket set, torque wrench.
• Remove the ignition coil as described previously.
• Install the new ignition coil, ensuring it is seated correctly.
• Torque the mounting bolts to specifications (usually around 7-10 ft-lbs).

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector.
• Using the multimeter, check for proper resistance across the injector terminals (specifications can vary, typically around 12-16 ohms).
• If the injector is faulty, replace it by removing the fuel rail and installing a new injector.

5. Perform Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug again for cylinder 1.
• Insert the compression tester and crank the engine.
• Record the compression reading and compare it with specifications (usually around 180-220 psi).
• If compression is low, further investigation of the valves or piston rings may be required.