how to fix P0302 code in Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

569 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.

Symptoms

•Check engine light illuminated
•Rough idle
•Engine stalling or hesitation during acceleration
•Decreased fuel economy
•Possible increase in exhaust emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code.
2
Inspect the ignition coil of cylinder 2 for damage or wear.
3
Check the spark plug in cylinder 2 for signs of fouling, wear, or improper gap.
4
Inspect the fuel injector for cylinder 2 to ensure it is functioning properly.
5
Conduct a compression test on cylinder 2 to check for mechanical issues.
6
Examine the wiring and connectors associated with the ignition coil and fuel injector for corrosion or damage.

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
•Spark plug socket
•Dielectric grease
•Fuel line removal tool

Parts Required

•Ignition coil (for cylinder 2)
•Spark plug (for cylinder 2)
•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.
2
Inspect the ignition coil of cylinder 2 for damage or wear.
3
Check the spark plug in cylinder 2 for signs of fouling, wear, or improper gap.
4
Inspect the fuel injector for cylinder 2 to ensure it is functioning properly.
5
Conduct a compression test on cylinder 2 to check for mechanical issues.
6
Examine the wiring and connectors associated with the ignition coil and fuel injector for corrosion or damage.

Solution

1. Preparation

Gather tools and parts required for repair.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery's negative terminal for safety.

2. Replace Ignition Coil

Tools Required: Socket set, torque wrench, dielectric grease.
Remove the engine cover if applicable.
Unplug the electrical connector from the ignition coil of cylinder 2.
Remove the retaining bolts using a socket set.
Carefully lift out the ignition coil.
Install the new ignition coil and torque the bolts to manufacturer's specifications.
Apply dielectric grease to the connector before plugging it back in.

3. Replace Spark Plug

Tools Required: Spark plug socket, torque wrench, gap tool.
Remove the ignition coil if it was not previously done.
Use a spark plug socket to remove the spark plug from cylinder 2.
Inspect the old spark plug for wear and gap specification.
Install a new spark plug, ensuring it is gapped correctly per manufacturer specifications.
Torque the new spark plug to the recommended value (usually around 13 ft-lbs).

4. Inspect/Replace Fuel Injector

Tools Required: Fuel line removal tool, socket set.
Disconnect the fuel line from the fuel injector (be cautious of fuel spray).
Remove the electrical connector from the fuel injector.
Unbolt and remove the fuel injector from the intake manifold.
If necessary, replace the fuel injector with a new one.
Reassemble the connector and fuel line, ensuring no leaks.