how to fix the 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 level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil by unbolting it and unplugging the electrical connector.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the old spark plug for wear and carbon buildup; replace if necessary.
  4. Install the new spark plug, ensuring it is torqued to the manufacturer's specifications (typically around 13-16 ft-lbs).
  5. Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if needed)

• Sub-steps:
  1. If the ignition coil showed abnormal resistance in the diagnostic step, remove the coil from cylinder 1.
  2. Install a new ignition coil.
  3. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Remove the fuel injector from cylinder 1 using the appropriate tools.
  2. Clean the injector using a fuel injector cleaner or replace it if necessary.
  3. Reinstall the fuel injector ensuring it is seated correctly.

5. Verify Compression

• Sub-steps:
  1. If compression was low, further diagnose the cause (e.g., head gasket issue).
  2. If compression is acceptable, proceed with reassembly.