AutoCodes – Toyota – P0304 2010 Toyota Camry

P0304 2010 Toyota Camry Code - Cylinder 4 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0304 2010 Toyota Camry indicates Cylinder 4 Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,417

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0304 2010 Toyota Camry Description

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted as when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire rate exceeds the threshold level, and could cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

OBDII Code P0304 2010 Toyota Camry - Cylinder 4 Misfire Detected - AutoCodes.com — P0304 2010 Toyota Camry Code - Cylinder 4 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2010 Toyota Camry?

Faulty Spark Plug #4
Clogged or faulty Fuel Injector #4
Faulty Ignition Coil #4
Fuel Injector #4 harness is open or shorted
Fuel Injector #4 circuit poor electrical connection
Ignition Coil #4 harness is open or shorted
Ignition Coil #4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0304 2010 Toyota Camry?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0304 2010 Toyota Camry code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0304 2010 Toyota Camry code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0304 2010 Toyota Camry Code

1. What are the common symptoms of OBDII code P0304 in a 2010 Toyota Camry?

Symptoms of code P0304, indicating a misfire in cylinder 4, may include rough idle, loss of power, engine vibrations, and potentially increased fuel consumption.

2. What are the possible causes of a cylinder 4 misfire in a 2010 Toyota Camry?

Common causes of a cylinder 4 misfire in a Toyota Camry can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or compression issues.

3. How can I diagnose the source of the misfire in cylinder 4 of my 2010 Toyota Camry?

To diagnose a cylinder 4 misfire, you can perform tests such as inspecting spark plugs, checking ignition coils, conducting a compression test, inspecting fuel injectors, and scanning for additional trouble codes.

4. Can driving with a cylinder 4 misfire in my 2010 Toyota Camry cause further damage?

Continuing to drive with a cylinder 4 misfire can potentially lead to damage to the catalytic converter, oxygen sensors, and other engine components, so it is advisable to address the issue promptly.

5. How can I repair a cylinder 4 misfire in my 2010 Toyota Camry?

Repairing a cylinder 4 misfire may involve replacing spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, performing a compression test, or seeking professional diagnostic assistance.

6. Are there any maintenance tips to prevent cylinder misfires in a 2010 Toyota Camry?

Regular maintenance, such as changing spark plugs at recommended intervals, using quality fuel, keeping the engine well-tuned, and promptly addressing any warning signs can help prevent cylinder misfires.

7. Is it safe to drive my 2010 Toyota Camry with the check engine light on due to a cylinder 4 misfire?

While it may be possible to drive a short distance with a cylinder 4 misfire, it is recommended to avoid prolonged driving as it can lead to further damage and potential safety risks.

8. What is the typical cost to repair a cylinder 4 misfire in a 2010 Toyota Camry?

The cost of repairing a cylinder 4 misfire can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix a cylinder 4 misfire in a 2010 Toyota Camry?

DIY enthusiasts with mechanical knowledge and the right tools may be able to address a cylinder 4 misfire by following repair guides and tutorials, but professional diagnosis and assistance are recommended for complex issues.

10. How long does it take to repair a cylinder 4 misfire in a 2010 Toyota Camry?

The time needed to repair a cylinder 4 misfire can vary based on the cause and extent of the issue. Simple repairs like replacing spark plugs may take less than an hour, while more complex diagnostics and repairs could take several hours or more.