AutoCodes – Toyota – P0304 2007 Toyota Camry

P0304 2007 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 2007 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 11,579

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 2007 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 2007 Toyota Camry - Cylinder 4 Misfire Detected - AutoCodes.com — P0304 2007 Toyota Camry Code - Cylinder 4 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2007 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 2007 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 2007 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 2007 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 2007 Toyota Camry Code

1. What does the OBDII code P0304 mean on a 2007 Toyota Camry?

P0304 indicates a misfire in cylinder 4, meaning that the combustion process in that cylinder is not happening correctly.

2. What are the common symptoms of a P0304 code in a 2007 Toyota Camry?

Symptoms may include rough idling, engine hesitation, reduced fuel efficiency, loss of power, and the check engine light turning on.

3. What causes a cylinder 4 misfire (P0304) in a 2007 Toyota Camry?

Common causes include a faulty spark plug, bad ignition coil, fuel injector issues, vacuum leaks, or low cylinder compression.

4. Can a dirty fuel injector cause a P0304 code?

Yes, a clogged or malfunctioning fuel injector in cylinder 4 can lead to improper fuel delivery, causing a misfire.

5. How can I diagnose the P0304 code on a 2007 Toyota Camry?

Start by checking the spark plug and ignition coil on cylinder 4, inspect for vacuum leaks, test the fuel injector, and perform a compression test if needed.

6. Is it safe to drive my 2007 Toyota Camry with a P0304 code?

Driving with a P0304 code is not recommended, as a misfire can damage the catalytic converter and lead to more expensive repairs if not addressed.

7. How can I fix a P0304 code on a 2007 Toyota Camry?

Replace the faulty spark plug or ignition coil, clean or replace the fuel injector, fix any vacuum leaks, and address any low compression issues in cylinder 4.

8. Can a bad ignition coil cause the P0304 code?

Yes, a failing ignition coil on cylinder 4 can result in insufficient spark and cause a misfire.

9. How much does it cost to repair a P0304 code in a 2007 Toyota Camry?

Repair costs vary but typically range from $100 to $300 for spark plug or ignition coil replacement. Extensive repairs, like fixing low compression, can cost more.

10. Will clearing the P0304 code without fixing the issue solve the problem?

No, clearing the code will only temporarily turn off the check engine light. The underlying issue must be resolved to prevent the code from returning.