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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for damage; replace if necessary.
• Install the new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.043 inches for Toyota).
• Torque the spark plug to the manufacturer’s specification (usually around 13-16 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1.
• Install the new ignition coil and secure it with the mounting bolts.
• Reconnect the electrical connector to the ignition coil.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or new fuel injector
• If cleaning, follow the kit instructions to clean the injector for cylinder 1.
• If replacing, disconnect the fuel line and electrical connector from the injector.
• Remove the old injector and install the new one, ensuring proper sealing and alignment.

5. Check Compression (If Necessary)

• Tools Required: Compression tester
• If misfire persists, conduct a compression test on cylinder 1.
• If compression is low, further diagnosis of engine internals may be required (head gasket, piston rings, etc.).