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Home/Cars/Toyota/Corolla/E170 (2013-2019)/how do I fix the P0301 misfire code on my Toyota Corolla E170 (2013-2019)?

how do I fix the P0301 misfire code on my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Severity: highDifficulty: mediumError Code: P03012-4 hours
4 min read
619 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 P0301 cylinder 1 misfire in Toyota Corolla. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0301
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Ensure the engine is cool before performing any repairs to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Decreased acceleration
  • •Engine stalling
  • •Poor fuel economy

Diagnostic Steps

  1. 1Scan the vehicle’s onboard diagnostics using an OBD-II scanner to confirm the P0301 code and check for any additional codes.
  2. 2Inspect the spark plug in cylinder 1 for wear, damage, or improper gap.
  3. 3Check the ignition coil for proper function by swapping it with another cylinder and re-scanning for codes.
  4. 4Examine the fuel injector for cylinder 1 to ensure it is not clogged or malfunctioning.
  5. 5Perform a compression test on cylinder 1 to rule out mechanical issues.
  6. 6Check for vacuum leaks around the intake manifold and vacuum hoses.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to ensure safety.
  • Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

  • Tools Required: Socket set, torque wrench, gap gauge.
  • Remove the ignition coil by unscrewing the mounting bolts and disconnecting the electrical connector.
  • Use a socket to remove the spark plug from cylinder 1.
  • Inspect the spark plug for signs of wear or damage. If necessary, replace it with a new spark plug ensuring the gap is set to manufacturer specifications (typically around 0.043 inches for a Corolla).
  • Reinstall the spark plug and torque it to the manufacturer’s specifications (usually around 13 lb-ft).
  • Reinstall the ignition coil and connect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

  • If the spark plug was in good condition but the misfire persists, proceed to inspect the ignition coil.
  • Swap the ignition coil with another cylinder (e.g., cylinder 2).
  • Clear the codes and start the engine to see if the misfire moves to the other cylinder. If it does, replace the ignition coil.

4. Inspect Fuel Injector (if necessary)

  • If the ignition coil is functioning correctly, check the fuel injector for cylinder 1.
  • Disconnect the electrical connector and remove the fuel injector.
  • Clean or replace the fuel injector as needed.
  • Reinstall the injector and reconnect the electrical connector.

5. Compression Test (if necessary)

  • If misfire continues, perform a compression test on cylinder 1.
  • Remove the spark plug and insert the compression tester into the cylinder.
  • Crank the engine and record the compression reading; it should be within the manufacturer’s specifications (typically around 180 psi).
  • If compression is low, further investigation of the cylinder’s internals (valves, piston rings) will be 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
  • Torque wrench
  • Gap gauge
  • Compression tester
  • Fuel injector cleaner

Parts Required

  • Spark plug(s)
  • Ignition coil (if needed)
  • Fuel injector (if needed)

Additional Information

Error CodeP0301
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

3 items

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