how to resolve P0301 code in my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
  • Tools Required: Socket set, ratchet.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon fouling, or damage; replace if necessary.
• Install a new spark plug, ensuring it is gapped correctly to manufacturer's specifications.
  • Torque the spark plug to 13 lb-ft (17.6 Nm).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for damage or malfunction.
• Replace the ignition coil for cylinder 1 if defective.
• Reinstall the ignition coil, ensuring proper connection to the spark plug.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Test the injector for proper function using a multimeter or fuel pressure gauge.
• Clean the fuel injector or replace it if it is clogged or not functioning correctly.

5. Perform Compression Test

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine to obtain a compression reading; compare it to manufacturer specifications.
• If compression is low, further diagnosis may be required (e.g., checking for valve issues).