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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, noid light.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil using a socket wrench.
  4. Remove the old spark plug with a spark plug socket.
  5. Install the new spark plug, hand-tighten, then torque to 13 lb-ft (18 Nm).
  6. Reinstall the ignition coil and reconnect the harness.

3. Replace Ignition Coil

• Sub-steps:
  1. If the ignition coil was found faulty in diagnostics, remove it from the engine.
  2. Install the new ignition coil and ensure it is seated properly.
  3. Reconnect the electrical connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Connect the noid light to the injector connector and crank the engine.
  3. If the light does not flash, the injector is not receiving a signal; inspect wiring or ECM.
  4. If the injector is faulty, remove and replace it with a new one.
  5. Reconnect the fuel injector harness.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and note the pressure reading.
  4. If the compression is below specifications (typically 150 psi), further investigation is needed for potential internal engine issues.