my Toyota Corolla E210 (2019-2024) keeps throwing a P0301 code, how can I fix this?

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil for cylinder 1:
  1. Unscrew the retaining bolts and gently pull out the ignition coil.
  2. Disconnect the electrical connector from the ignition coil.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew and remove the spark plug.
• Inspect the spark plug:
  1. Check for excessive wear, carbon buildup, or damage.
  2. Replace with a new spark plug if necessary, ensuring it matches OEM specifications.
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter
• Test the ignition coil:
  1. Use a multimeter to check for resistance within the specified range.
  2. If out of range, replace the ignition coil with a new one.
• Reinstall the ignition coil if it was not replaced.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool
• Test the fuel injector:
  1. Use a noid light or multimeter to check for proper electrical signal.
  2. If the injector is faulty, remove it following the manufacturer's instructions.
• Replace it with an OEM or equivalent fuel injector.

5. Conduct Compression Test (if necessary)

• Tools Required: Compression gauge
• Perform a compression test on cylinder 1:
  1. Remove the spark plug and install the compression gauge.
  2. Crank the engine and record the compression reading.
  3. Compare with manufacturer specifications; if low, further investigation may be required.