AutoCodes – Toyota – P0304 2011 Toyota Camry

P0304 2011 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 2011 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 7,152

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 2011 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 2011 Toyota Camry - Cylinder 4 Misfire Detected - AutoCodes.com — P0304 2011 Toyota Camry Code - Cylinder 4 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2011 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 2011 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 2011 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 2011 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 2011 Toyota Camry Code

1. What does the OBDII code P0304 mean on a 2011 Toyota Camry?

P0304 indicates a misfire has been detected in cylinder 4 of the engine.

2. What are the common symptoms of a P0304 code in a 2011 Toyota Camry?

Symptoms may include a rough idle, reduced engine performance, poor fuel economy, the Check Engine Light illuminating, and possible engine hesitation or stalling.

3. What causes a P0304 code in a 2011 Toyota Camry?

Common causes include a faulty spark plug, a damaged ignition coil, a clogged fuel injector, low cylinder compression, or a vacuum leak near cylinder 4.

4. Can I drive my 2011 Toyota Camry with a P0304 code?

While it may still run, driving with a misfire can damage the catalytic converter and lead to further engine issues. Itâ€™s best to address the problem promptly.

5. How do I diagnose a P0304 code in my 2011 Toyota Camry?

Start by inspecting the spark plug and ignition coil for cylinder 4, checking for vacuum leaks, ensuring proper fuel delivery, and performing a compression test if needed.

6. How do I fix a P0304 code in a 2011 Toyota Camry?

Common fixes include replacing the cylinder 4 spark plug or ignition coil, cleaning or replacing the fuel injector, repairing vacuum leaks, or addressing low compression issues.

7. How much does it cost to repair a P0304 code on a Toyota Camry?

Repair costs vary depending on the issueâ€”replacing a spark plug or ignition coil may cost $100â€“$300, while more extensive repairs like fixing compression problems could be significantly higher.

8. Can a dirty air filter cause a P0304 code in a 2011 Toyota Camry?

While unlikely, a severely clogged air filter could contribute to engine performance issues, potentially exacerbating a misfire.

9. Will clearing the P0304 code with a scanner fix the problem?

Clearing the code may reset the Check Engine Light temporarily, but the underlying issue causing the misfire must be addressed to prevent the code from returning.

10. Can bad fuel cause a P0304 code in my 2011 Toyota Camry?

Yes, contaminated or low-quality fuel can cause incomplete combustion and lead to a misfire in cylinder 4.