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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector.
  3. Unbolt and remove the ignition coil from cylinder 1.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for damage; replace if necessary.
  6. Install the new spark plug and torque to manufacturer's specification (typically around 13 ft-lbs).
  7. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil

• Sub-steps:
  1. Use a multimeter to test the resistance of the ignition coil (specifications can usually be found in the service manual).
  2. If the coil is faulty, remove it and replace it with a new one.
  3. Reconnect the ignition coil and ensure all connections are secure.

4. Check and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector.
  2. Use a noid light to check for signal to the injector while cranking the engine.
  3. If the injector is not functioning, replace it with a new one.
  4. Reconnect the fuel injector and its connector.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1 and insert the compression tester.
  2. Crank the engine and record the compression reading.
  3. If the reading is below specifications (typically around 130-200 PSI), further investigation into internal engine issues is required.