how to fix P0302 misfire code on Toyota Camry XV50 (2012-2017)

Toyota Camry XV80 (2025-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

4 min read

684 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 Camry XV50 (2012-2017). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0302

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the negative battery terminal to prevent electrical shorts.

Symptoms

•Check engine light illuminated
•Rough idle when the engine is running
•Decreased acceleration or power
•Engine stalling or hesitation during acceleration
•Increased fuel consumption
•Unusual engine noises (e.g., popping or backfiring)

Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes to confirm P0302 and check for additional codes.
2
Inspect the ignition system components, including spark plug and ignition coil for cylinder 2.
3
Perform a visual inspection of the fuel injector for cylinder 2 for any signs of blockage or leaks.
4
Check the engine's vacuum lines and intake manifold for leaks that could affect cylinder 2's performance.
5
Conduct a compression test on cylinder 2 to assess the mechanical health of the engine.
6
If applicable, check the fuel pressure to ensure proper fuel delivery to the engine.

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 (including spark plug socket)
•Torque wrench
•Ratchet and extensions
•Flathead screwdriver (for clips if applicable)

Parts Required

•New spark plug (specifically for the Camry)
•New ignition coil (if needed)
•New fuel injector (if needed)

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes to confirm P0302 and check for additional codes.
2
Inspect the ignition system components, including spark plug and ignition coil for cylinder 2.
3
Perform a visual inspection of the fuel injector for cylinder 2 for any signs of blockage or leaks.
4
Check the engine's vacuum lines and intake manifold for leaks that could affect cylinder 2's performance.
5
Conduct a compression test on cylinder 2 to assess the mechanical health of the engine.
6
If applicable, check the fuel pressure to ensure proper fuel delivery to the engine.

Solution

1. Preparation

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

2. Replace Spark Plug

Remove the ignition coil from cylinder 2:
- Unscrew the bolts securing the coil (typically 10mm).
- Carefully pull the coil straight up to avoid damaging the connector.
Remove the spark plug:
- Use a spark plug socket and ratchet to unscrew the spark plug from cylinder 2.
- Inspect the old spark plug for wear and carbon buildup.
Install the new spark plug:
- Apply a small amount of anti-seize compound on the threads of the new spark plug.
- Hand-tighten the spark plug, then torque it to the manufacturer's specification (usually around 13-15 lb-ft).
Reinstall the ignition coil and secure it with the bolts.

3. Replace Ignition Coil (if necessary)

If the ignition coil was found faulty during inspection:
- Disconnect the electrical connector from the coil.
- Remove the coil from the spark plug hole.
- Install the new ignition coil by reversing the removal steps and securing it firmly.

4. Replace Fuel Injector (if necessary)

Disconnect the fuel rail from the injector:
- Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
- Disconnect the fuel line and the electrical connector from the fuel injector.
Remove the fuel injector:
- Unscrew any retaining clips if present and pull the injector out carefully.
Install the new injector:
- Lubricate the O-ring of the new injector with engine oil.
- Push the injector into the fuel rail and secure it with clips.
Reconnect the fuel line and electrical connectors.

5. Final Checks

Reconnect the negative battery terminal.
Start the engine and allow it to idle.
Monitor for any abnormal sounds or check engine light re-illumination.