how to fix a Toyota Camry with a P0302 misfire code

Toyota Camry Seventh Generation (2012-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

4 min read

614 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. 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.
•Relieve fuel system pressure before disconnecting fuel lines.

Symptoms

•Check engine light illuminated
•Rough idle
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Increased exhaust emissions
•Unusual engine noises (e.g., popping or backfiring)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for additional codes.
2
Inspect spark plug in cylinder 2 for wear, damage, or fouling.
3
Test the ignition coil for cylinder 2 for proper operation using a multimeter.
4
Perform a compression test on cylinder 2 to check for internal engine problems.
5
Check fuel injector functionality for cylinder 2 by listening for clicking sounds or using an injector tester.
6
Inspect wiring and connectors associated with the ignition coil and fuel injector for damage or corrosion.

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)
•Ratchet and extensions
•Torque wrench
•Multimeter
•Fuel injector tester (optional)

Parts Required

•Spark plug (specific to the vehicle model)
•Ignition coil (if faulty)
•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 additional codes.
2
Inspect spark plug in cylinder 2 for wear, damage, or fouling.
3
Test the ignition coil for cylinder 2 for proper operation using a multimeter.
4
Perform a compression test on cylinder 2 to check for internal engine problems.
5
Check fuel injector functionality for cylinder 2 by listening for clicking sounds or using an injector tester.
6
Inspect wiring and connectors associated with the ignition coil and fuel injector for damage or corrosion.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative terminal of the battery to prevent electrical shorts.
Allow the engine to cool before starting repairs.

2. Replace Spark Plug

Remove the ignition coil for cylinder 2:
- Unplug the electrical connector from the ignition coil.
- Remove the mounting bolt(s) securing the ignition coil and carefully pull it out.
Remove the spark plug:
- Use a spark plug socket and ratchet to remove the spark plug from cylinder 2.
Install the new spark plug:
- Gap the new spark plug to the manufacturer's specifications.
- Apply a small amount of anti-seize compound on the threads (optional).
- Install the spark plug and torque it to the manufacturer's specifications (typically 13-20 lb-ft).
Reinstall the ignition coil:
- Position the ignition coil back onto the spark plug and secure it with the mounting bolt(s).
- Reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

Use a multimeter to measure the resistance of the ignition coil:
- Check the primary and secondary resistance according to manufacturer specifications.
If the coil is faulty, replace it with a new one:
- Follow the same steps as above for removal and installation.

4. Inspect and Replace Fuel Injector (if necessary)

Remove the fuel rail to access the fuel injector:
- Relieve fuel pressure, disconnect fuel lines, and remove the mounting bolts for the fuel rail.
Remove the faulty fuel injector:
- Pull the injector straight out of the rail.
Install the new fuel injector:
- Lubricate the O-rings with clean engine oil and insert the injector into the rail.
- Reattach the fuel rail and reconnect all lines.