how to fix P0302 misfire in Toyota Corolla E140 (2006-2013)

Toyota Corolla E140 (2006-2013)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

586 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 P0302 cylinder 2 misfire in Toyota Corolla. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0302

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before starting repairs to avoid burns.

Symptoms

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

Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0302 code and check for any additional codes.
2
Inspect the spark plug in cylinder 2 for wear, deposits, or damage.
3
Check the ignition coil for cylinder 2 for proper function and signs of damage.
4
Verify fuel injector operation for cylinder 2 by listening for clicking sounds or performing a resistance test.
5
Inspect the wiring and connectors for the ignition coil and fuel injector for any signs of corrosion or damage.
6
Perform a compression test on cylinder 2 to ensure it has adequate compression.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Spark plug socket
•Torque wrench
•Ratchet set
•Multimeter or noid light

Parts Required

•Spark plug (for cylinder 2)
•Ignition coil (for cylinder 2)
•Fuel injector (if faulty)

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Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0302 code and check for any additional codes.
2
Inspect the spark plug in cylinder 2 for wear, deposits, or damage.
3
Check the ignition coil for cylinder 2 for proper function and signs of damage.
4
Verify fuel injector operation for cylinder 2 by listening for clicking sounds or performing a resistance test.
5
Inspect the wiring and connectors for the ignition coil and fuel injector for any signs of corrosion or damage.
6
Perform a compression test on cylinder 2 to ensure it has adequate compression.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Spark Plug

Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
Remove the ignition coil from cylinder 2:
1. Unplug the electrical connector from the ignition coil.
2. Remove the bolt securing the ignition coil using a socket.
3. Gently pull the ignition coil out of the spark plug well.
Remove the old spark plug:
1. Use a spark plug socket to unscrew the old spark plug.
2. Inspect the spark plug for wear; clean the spark plug hole to remove debris.
Install the new spark plug:
1. Apply anti-seize compound to the threads of the new spark plug.
2. Insert the new spark plug into the cylinder and tighten to the manufacturer's specified torque (typically around 13-15 lb-ft).

3. Replace Ignition Coil

Tools Required: Socket set.
Remove the old ignition coil:
1. If not already removed, take off the ignition coil as detailed in step 2.
2. Disconnect the wiring harness from the ignition coil.
Install the new ignition coil:
1. Connect the wiring harness to the new ignition coil.
2. Secure the ignition coil to the cylinder head with the bolt and torque to specification.

4. Check Fuel Injector

Tools Required: Multimeter or noid light.
Inspect the fuel injector:
1. Connect a multimeter to the injector terminals to check for resistance (specification typically around 12-16 ohms).
2. If the injector is faulty, replace it with a new one.
Reinstall any components removed for access.

5. Reassemble and Test

Reconnect the negative battery terminal.
Start the engine and allow it to idle for a few minutes.
Check for any error codes using the OBD-II scanner.