how to fix P0302 misfire 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

4 min read

621 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 E170 (2013-2019). 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 engine to cool before performing any repairs to avoid burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Increased exhaust emissions or unusual smells

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code and check for any accompanying codes.
2
Inspect the spark plug and ignition coil for cylinder 2 for damage or wear.
3
Perform a visual inspection of the fuel injector for cylinder 2 for clogs or leaks.
4
Check the engine compression in cylinder 2 to ensure proper sealing.
5
Test the wiring and connectors of the ignition coil and fuel injector for damage or corrosion.
6
Verify the fuel pressure using a fuel pressure gauge to ensure adequate delivery to the injectors.

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
•Compression tester
•Fuel pressure gauge
•Ratchet and extension
•Dielectric grease
•Fuel injector cleaner

Parts Required

•Spark plug (specific to model)
•Ignition coil (if necessary)
•Fuel injector (if necessary)

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 accompanying codes.
2
Inspect the spark plug and ignition coil for cylinder 2 for damage or wear.
3
Perform a visual inspection of the fuel injector for cylinder 2 for clogs or leaks.
4
Check the engine compression in cylinder 2 to ensure proper sealing.
5
Test the wiring and connectors of the ignition coil and fuel injector for damage or corrosion.
6
Verify the fuel pressure using a fuel pressure gauge to ensure adequate delivery to the injectors.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plug and Ignition Coil

Tools Required: Socket set, torque wrench, ratchet, extension, dielectric grease.
Remove the engine cover if necessary.
Remove the bolt securing the ignition coil in place and disconnect the electrical connector.
Pull out the ignition coil.
Remove the spark plug using a spark plug socket.
Inspect the old spark plug for wear; if it’s damaged, replace it with a new one.
Apply a small amount of dielectric grease to the inside of the ignition coil boot.
Install the new spark plug to the manufacturer's torque specification (typically 13-15 ft-lbs).
Reinstall the ignition coil, ensuring it is seated correctly, and reconnect the electrical connector.

3. Inspect and Clean Fuel Injector

Tools Required: Fuel injector cleaner, safety glasses, gloves.
Remove the intake manifold cover if necessary.
Disconnect the fuel injector connector for cylinder 2.
Remove the fuel rail bolts and carefully pull the fuel rail away from the injector.
Extract the injector from the rail; inspect for clogs or damage.
Clean the injector using a fuel injector cleaner or replace it if necessary.
Reinstall the fuel injector and ensure it is secured into the rail before reassembling.

4. Perform Compression Test

Tools Required: Compression tester.
Remove the spark plug for cylinder 2 and insert the compression tester.
Crank the engine and note the compression reading; compare with manufacturer specifications (typically 150-200 psi).
If the compression is low, further diagnosis is needed to check for valve issues or head gasket failure.