how to fix Toyota Camry XV50 (2012-2017) P0301 misfire code

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0301

3 min read

494 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 P0301 cylinder 1 misfire in Toyota Camry XV50 (2012-2017). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0301

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 removing components to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle
•Decreased acceleration or power
•Engine stalling at low RPMs
•Poor fuel economy
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0301 code.
2
Inspect the ignition coil and spark plug for cylinder 1 visually.
3
Check for vacuum leaks around intake manifold and hoses.
4
Test the ignition coil for proper resistance using a multimeter.
5
Measure the spark plug gap and inspect for wear.
6
Conduct a compression test on cylinder 1 to assess engine health.

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
•Multimeter
•Spark plug socket
•Ratchet

Parts Required

•New spark plug (specific to Toyota Camry)
•New ignition coil (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0301 code.
2
Inspect the ignition coil and spark plug for cylinder 1 visually.
3
Check for vacuum leaks around intake manifold and hoses.
4
Test the ignition coil for proper resistance using a multimeter.
5
Measure the spark plug gap and inspect for wear.
6
Conduct a compression test on cylinder 1 to assess engine health.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

Sub-steps:
1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
2. Remove the spark plug using a spark plug socket and ratchet.
3. Inspect the old spark plug for wear or damage.
4. Install a new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.043 inches).
5. Torque the spark plug to the manufacturer's specifications (usually around 13 lb-ft).

3. Replace Ignition Coil (if necessary)

Sub-steps:
1. If the ignition coil tests out of specification, replace it with a new coil.
2. Install the new ignition coil onto the spark plug and secure it with the retaining bolts.
3. Reconnect the electrical connector to the ignition coil.

4. Check for Vacuum Leaks

Sub-steps:
1. Inspect vacuum hoses for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
3. Repair or replace any damaged hoses.

5. Reconnect Battery and Clear Codes

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear the P0301 code and check for any new codes.