how to fix P0302 code in Toyota Corolla E210 (2019-2024)

Toyota Corolla E210 (2019-2024)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

597 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 E210 (2019-2024). 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 removing any components to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Decreased fuel economy
•Engine stalling or hesitation
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
2
Inspect the ignition coil and spark plug for cylinder 2 for signs of wear or damage.
3
Perform a visual inspection of the wiring harness and connectors related to cylinder 2.
4
Conduct a compression test on cylinder 2 to check for mechanical issues.
5
Test the fuel injector for cylinder 2 to ensure it is functioning properly.
6
Check for vacuum leaks around the intake manifold and related components.

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
•Multimeter
•Compression tester
•Fuel injector removal tool

Parts Required

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

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
2
Inspect the ignition coil and spark plug for cylinder 2 for signs of wear or damage.
3
Perform a visual inspection of the wiring harness and connectors related to cylinder 2.
4
Conduct a compression test on cylinder 2 to check for mechanical issues.
5
Test the fuel injector for cylinder 2 to ensure it is functioning properly.
6
Check for vacuum leaks around the intake manifold and related components.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

Tools Required: Socket set, spark plug socket, torque wrench.
Remove the engine cover if applicable.
Carefully disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
Remove the old spark plug using a spark plug socket.
Install the new spark plug hand-tight, then torque to the manufacturer’s specification (typically around 13 lb-ft).
Reinstall the ignition coil and reconnect the connector.

3. Inspect/Replace Ignition Coil

If the spark plug replacement does not solve the issue, inspect the ignition coil.
Tools Required: Socket set, multimeter (for testing).
Remove the ignition coil from cylinder 2.
Test the ignition coil with a multimeter for resistance; replace if outside manufacturer specifications.
Install a new ignition coil if necessary and reconnect it.

4. Fuel Injector Inspection/Replacement

If ignition components are functioning properly, inspect the fuel injector.
Tools Required: Fuel injector removal tool, socket set.
Disconnect the fuel injector connector and remove the fuel rail if necessary.
Remove the fuel injector for cylinder 2.
Inspect and clean the injector, or replace it with a new one if it is faulty.
Reinstall the fuel injector, ensuring proper sealing.

5. Compression Test (if needed)

If misfire persists, perform a compression test.
Tools Required: Compression tester.
Remove spark plugs from all cylinders.
Insert the compression tester into cylinder 2 and crank the engine.
Compare the compression readings to manufacturer specifications; replace engine components if readings are low.