how to fix P0301 code on Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Remove Engine Cover (if applicable):
  • Use a socket set to remove any bolts securing the engine cover.
• Remove Spark Plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug from cylinder 1.
• Inspect Spark Plug:
  • Check for signs of wear, carbon buildup, or damage.
• Replace Spark Plug:
  • Install a new spark plug (OEM specifications) by hand-tightening then torque to 13-16 lb-ft using a torque wrench.

3. Inspect and Replace Ignition Coil

• Remove Ignition Coil:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the bolts securing the ignition coil using a socket set.
  • Gently pull the ignition coil out of the spark plug well.
• Inspect Ignition Coil:
  • Check for cracks or signs of wear.
• Replace Ignition Coil:
  • Install a new ignition coil in place, secure with bolts, and reconnect the electrical connector.

4. Inspect Fuel Injector

• Check Fuel Injector:
  • Use a multimeter to test the resistance of the fuel injector. Compare with specifications from the manufacturer.
• Replace Fuel Injector (if necessary):
  • Disconnect the fuel line (use a fuel line disconnect tool if needed).
  • Remove the fuel injector using the appropriate tools.
  • Install a new fuel injector and reconnect the fuel line.

5. Verify Compression (if needed)

• Perform Compression Test:
  • Remove the spark plug from cylinder 1.
  • Insert the compression tester into the spark plug hole and crank the engine.
  • Compare the reading to factory specifications (usually around 180 psi).
• Address any low compression issues as necessary.