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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, spark plug socket, compression tester, multimeter, fuel injector tester (noid light).
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate and disconnect the ignition coil connector for cylinder 1.
  3. Remove the bolts securing the ignition coil and carefully pull it out.
  4. Install the new ignition coil by reversing the removal steps, ensuring it's seated properly.
  5. Reconnect the ignition coil connector.

3. Inspect and Replace Spark Plug

• Sub-steps:
  1. Use a spark plug socket to remove the spark plug from cylinder 1.
  2. Inspect the plug for wear, deposits, or damage; replace if necessary.
  3. Check the spark plug gap using a feeler gauge and adjust if needed or replace with a new spark plug.
  4. Install the spark plug by hand and torque it to the manufacturer's specification (typically around 13 ft-lbs).

4. Conduct Compression Test

• Sub-steps:
  1. Remove the ignition coil and spark plug for cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and note the compression reading.
  4. If compression is low (below manufacturer's specification), further diagnostics may be required.

5. Inspect and Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Connect a noid light or multimeter to the injector connector to check for signal while cranking the engine.
  3. If no signal is detected, check wiring and ECM.
  4. If the injector is faulty, remove it and replace it with a new one.