AutoCodes – Toyota – P0304 2008 Toyota Camry

P0304 2008 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 2008 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 6,524

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 2008 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 2008 Toyota Camry - Cylinder 4 Misfire Detected - AutoCodes.com — P0304 2008 Toyota Camry Code - Cylinder 4 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2008 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 2008 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 2008 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 2008 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 2008 Toyota Camry Code

1. What are the common symptoms of OBDII code P0304 in a 2008 Toyota Camry?

- Common symptoms of cylinder 4 misfire detected (P0304) in a 2008 Toyota Camry include rough idling, loss of power, engine vibration, and potential increase in fuel consumption.

2. What are the possible causes of a cylinder 4 misfire in a 2008 Toyota Camry?

- The common causes of a cylinder 4 misfire in a 2008 Toyota Camry can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or even low compression in the cylinder.

3. How can I diagnose and repair a cylinder 4 misfire in my 2008 Toyota Camry?

- To diagnose and repair a cylinder 4 misfire in a 2008 Toyota Camry, start by checking the spark plugs, ignition coils, and fuel injector for cylinder 4. You may also want to perform a compression test to rule out any internal engine issues.

4. Can driving with a cylinder 4 misfire damage my 2008 Toyota Camry?

- Driving with a cylinder 4 misfire in a 2008 Toyota Camry can potentially cause damage to the catalytic converter, oxygen sensor, or other engine components. It is recommended to address the issue promptly to prevent further damage.

5. How much does it typically cost to repair a cylinder 4 misfire in a 2008 Toyota Camry?

- The cost to repair a cylinder 4 misfire in a 2008 Toyota Camry can vary depending on the exact cause of the issue. Typically, the cost can range from $100 for a simple spark plug replacement to $500 or more for more complex repairs involving ignition coils or fuel injectors.

6. Can a cylinder 4 misfire be intermittent in a 2008 Toyota Camry?

- Yes, a cylinder 4 misfire in a 2008 Toyota Camry can sometimes be intermittent, meaning it may come and go. This could be due to factors like temperature changes, engine load, or fuel quality affecting the combustion process.

7. How long can I drive with a cylinder 4 misfire before repairing it in my 2008 Toyota Camry?

- It is not recommended to drive for an extended period with a cylinder 4 misfire in a 2008 Toyota Camry. Continuing to drive with a misfire can lead to further damage and potentially more costly repairs in the future.

8. Will resetting the OBDII code P0304 in my 2008 Toyota Camry make the misfire go away?

- Resetting the OBDII code P0304 in a 2008 Toyota Camry may temporarily clear the check engine light, but it will not fix the underlying issue causing the misfire. It is important to diagnose and address the root cause of the problem.

9. Can a dirty air filter cause a cylinder 4 misfire in a 2008 Toyota Camry?

- While a dirty air filter is not a common cause of a cylinder 4 misfire in a 2008 Toyota Camry, a severely clogged air filter could potentially affect air intake and combustion. It is recommended to check and replace the air filter if necessary during diagnosis.

10. Is it necessary to use OEM parts for repairing a cylinder 4 misfire in a 2008 Toyota Camry?

- While using OEM parts is recommended for optimal performance and compatibility, high-quality aftermarket parts can also be used to repair a cylinder 4 misfire in a 2008 Toyota Camry. Ensure the parts meet or exceed the specifications of the original components.