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Home/Cars/Toyota/Corolla/E170 (2013-2019)/how to fix P0300 misfire code in Toyota Corolla E170 (2013-2019)

how to fix P0300 misfire code in Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Severity: highDifficulty: mediumError Code: P03002-4 hours
3 min read
572 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0300 random/multiple cylinder misfire in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0300
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before inspecting or removing components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle during engine operation
  • •Loss of power during acceleration
  • •Increased fuel consumption
  • •Engine stalling intermittently

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0300 and check for any additional codes.
  2. 2Inspect spark plugs for wear or damage and check for proper gap.
  3. 3Check ignition coils using a multimeter to ensure they are functioning correctly.
  4. 4Test fuel pressure using a fuel pressure gauge to verify that the fuel system is delivering adequate pressure.
  5. 5Inspect the air intake system for leaks or obstructions that could affect air-fuel mixture.
  6. 6Conduct a visual inspection of the wiring and connectors related to ignition coils and fuel injectors for damage.

Solution

Solution

1. Preparation

  • Gather tools and parts needed for repair.
  • Ensure the vehicle is parked on a level surface and the engine is cool.
  • Disconnect the negative battery cable to prevent any electrical shorts.

2. Replace Spark Plugs

  • Remove the engine cover if necessary using a socket set.
  • Disconnect the ignition coil connectors from the spark plugs.
  • Remove the ignition coils using a socket wrench and set them aside.
  • Use a spark plug socket to remove the old spark plugs.
  • Install new spark plugs, ensuring they are gapped correctly (typically 0.043 inches for the Corolla).
  • Reinstall the ignition coils and reconnect the connectors.
  • Replace the engine cover.

3. Inspect and Replace Ignition Coils (if necessary)

  • If any ignition coils failed the multimeter test, remove the faulty coils as previously described.
  • Install new ignition coils, ensuring proper alignment and sealing.
  • Reconnect the ignition coil connectors.

4. Fuel System Check

  • Attach a fuel pressure gauge to the fuel rail Schrader valve.
  • Turn the ignition key to the "ON" position (do not start the engine) and record the fuel pressure reading.
  • If the reading is below specifications (typically around 43-50 psi), consider replacing the fuel pump or checking the fuel filter for clogs.

5. Air Intake Inspection

  • Inspect the air filter and replace it if dirty.
  • Check the intake hoses for leaks or cracks and replace any damaged components.
  • Ensure the mass air flow (MAF) sensor is clean; use MAF cleaner if necessary.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Multimeter
  • Fuel pressure gauge
  • Torque wrench

Parts Required

  • Spark plugs
  • Ignition coils (if faulty)
  • Fuel filter (if applicable)

Additional Information

Error CodeP0300
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

3 items

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