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

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

531 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

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before performing repairs to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle or unstable engine performance
•Loss of power during acceleration
•Increased fuel consumption
•Engine stalling or hesitation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
2
Inspect spark plug and ignition coil in cylinder 2 for wear or damage.
3
Check fuel injector function for cylinder 2 using a noid light or multimeter.
4
Perform a compression test on cylinder 2 to rule out mechanical issues.
5
Inspect vacuum lines and intake manifold for leaks that could cause a misfire.
6
Check the engine for any signs of oil or coolant leaks into the combustion chamber.

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
•Noid light or multimeter
•Compression tester

Parts Required

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

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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 spark plug and ignition coil in cylinder 2 for wear or damage.
3
Check fuel injector function for cylinder 2 using a noid light or multimeter.
4
Perform a compression test on cylinder 2 to rule out mechanical issues.
5
Inspect vacuum lines and intake manifold for leaks that could cause a misfire.
6
Check the engine for any signs of oil or coolant leaks into the combustion chamber.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface with the engine cool.
Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

Remove the ignition coil and spark plug from cylinder 2.
Inspect the spark plug for fouling, wear, or damage. Replace if necessary.
Torque the new spark plug to the manufacturer's specification (usually around 13 lb-ft).
Reinstall the ignition coil ensuring it clicks into place.

3. Inspect and Replace Ignition Coil

If the spark plug is in good condition, inspect the ignition coil for damage.
Replace the ignition coil if visual inspection shows cracks or wear.
Torque the ignition coil bolts to the specified value (typically around 7.2 lb-ft).

4. Check and Replace Fuel Injector

If issues persist, remove the fuel injector for cylinder 2.
Test the injector with a noid light or multimeter to confirm proper operation.
Replace the fuel injector if it is not functioning correctly.
Reinstall the injector and secure it according to manufacturer's specifications.

5. Final Assembly and Reset

Reconnect the battery terminal.
Clear the error codes using the OBD-II scanner.
Start the engine and allow it to reach operating temperature.