how to fix P0305 code in Toyota Camry Eighth Generation (2018-present)

Toyota Camry Eighth Generation (2018-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0305

3 min read

568 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 P0305 cylinder 5 misfire in Toyota Camry. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0305

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the hood to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased power during acceleration
•Poor fuel economy
•Increased exhaust emissions
•Engine stalling or hesitation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0305.
2
Inspect the spark plug for cylinder 5 for wear or damage.
3
Check the ignition coil for cylinder 5 for proper operation.
4
Perform a compression test on cylinder 5 to rule out mechanical issues.
5
Inspect fuel injector operation for cylinder 5.
6
Check for vacuum leaks in the intake manifold near cylinder 5.

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
•Spark plug socket
•Ratchet
•Torque wrench
•Compression tester
•Multimeter
•Socket set

Parts Required

•Spark plug for cylinder 5
•Ignition coil (if necessary)
•Fuel injector (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0305.
2
Inspect the spark plug for cylinder 5 for wear or damage.
3
Check the ignition coil for cylinder 5 for proper operation.
4
Perform a compression test on cylinder 5 to rule out mechanical issues.
5
Inspect fuel injector operation for cylinder 5.
6
Check for vacuum leaks in the intake manifold near cylinder 5.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative terminal of the battery.
Ensure the engine is cool before starting work.

2. Replace Spark Plug

Tools Required: Spark plug socket, ratchet, torque wrench.
Remove the ignition coil cover (if applicable) by unscrewing the bolts.
Disconnect the electrical connector from the ignition coil for cylinder 5.
Remove the ignition coil by unscrewing it from the cylinder head.
Use the spark plug socket to remove the old spark plug from cylinder 5.
Install the new spark plug, hand-tighten, then torque to manufacturer specifications (typically around 13-16 lb-ft).
Reinstall the ignition coil, securing it with bolts and reconnecting the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

If the ignition coil shows signs of damage or wear during inspection, replace it with a new one.
Tools Required: Ratchet, socket set.
Carefully remove the old ignition coil and install the new one, ensuring a secure fit.

4. Check Fuel Injector

Tools Required: Fuel injector cleaner or replacement injector as needed.
Test the fuel injector for cylinder 5 using a multimeter or by swapping with a known good injector from another cylinder.
If faulty, replace the fuel injector with a new one, ensuring proper seating and connections.

5. Compression Test (if misfire persists)

Tools Required: Compression tester.
Remove spark plugs and connect the compression tester to cylinder 5.
Crank the engine and check the compression reading. Compare with specifications (typically around 150-200 psi).
If compression is low, further investigation into internal engine components may be necessary.