how to fix the P0302 misfire on my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

4 min read

608 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 systems.
•Allow the engine to cool before opening any components related to the ignition system.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Increased fuel consumption
•Engine stalling at low RPMs

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code and check for any additional codes.
2
Inspect the spark plug for cylinder 2 for wear, fouling, or damage.
3
Check the ignition coil for cylinder 2 for proper operation and signs of arcing.
4
Perform a compression test on cylinder 2 to assess engine health.
5
Examine fuel injector operation for cylinder 2 using a noid light or multimeter.
6
Inspect wiring and connectors associated with the ignition and fuel injection system for damage or corrosion.

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
•Socket set
•Torque wrench
•Multimeter
•Compression tester
•Noid light

Parts Required

•Spark plug (specific to Toyota Corolla)
•Ignition coil (if faulty)
•Fuel injector (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code and check for any additional codes.
2
Inspect the spark plug for cylinder 2 for wear, fouling, or damage.
3
Check the ignition coil for cylinder 2 for proper operation and signs of arcing.
4
Perform a compression test on cylinder 2 to assess engine health.
5
Examine fuel injector operation for cylinder 2 using a noid light or multimeter.
6
Inspect wiring and connectors associated with the ignition and fuel injection system for damage or corrosion.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, noid light.
Disconnect the negative battery terminal to ensure safety.
Allow the engine to cool before beginning work.

2. Replace Spark Plug

Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
Disconnect the electrical connector from the ignition coil.
Remove the old spark plug using a spark plug socket.
Inspect the spark plug hole for debris and clean as necessary.
Install the new spark plug, ensuring it is gapped correctly (typically 0.043 inches for Corolla).
Torque the spark plug to manufacturer specifications (usually around 13-16 lb-ft).
Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

If the spark plug replacement does not resolve the issue, test the ignition coil.
Use a multimeter to check the primary and secondary resistance of the coil against manufacturer specifications.
If the ignition coil is faulty, replace it with a new one.
Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

If the ignition components are functioning correctly, check the fuel injector for cylinder 2.
Remove the fuel rail according to the manufacturer’s instructions.
Use a noid light to check for proper signal to the injector.
If the injector is not functioning, replace it with a new one.
Reassemble the fuel rail and reconnect all components.

5. Perform Compression Test

If all previous steps fail to resolve the issue, perform a compression test on cylinder 2.
If compression is low, further investigation into the internal engine components may be necessary.
Address any internal engine issues such as valve problems or piston ring wear.