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Engine-Codes – Toyota – P0304 1999 Toyota Camry

P0304 1999 Toyota Camry Code - Cylinder 4 Misfire Detected

Quick Answer

When the OBD-II system in a vehicle detects a misfire in a specific cylinder, it will generate a diagnostic trouble code (DTC) such as P0304, which indicates a misfire in cylinder 4 of the engine. Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 4, Clogged or malfunctioning fuel injector. 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 1999 Toyota Camry indicates Cylinder 4 Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 4, Clogged or malfunctioning fuel injector.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0304 1999 Toyota Camry Description

When the OBD-II system in a vehicle detects a misfire in a specific cylinder, it will generate a diagnostic trouble code (DTC) such as P0304, which indicates a misfire in cylinder 4 of the engine. A misfire occurs when the air-fuel mixture in the combustion chamber fails to ignite properly, causing the engine to run rough, lose power, and potentially emit higher levels of emissions.

OBDII Code P0304 1999 Toyota Camry - Cylinder 4 Misfire Detected
P0304 1999 Toyota Camry Code - Cylinder 4 Misfire Detected

Common Causes of P0304 1999 Toyota Camry

  1. Worn or fouled spark plugs
  2. Faulty ignition coil in cylinder 4
  3. Clogged or malfunctioning fuel injector
  4. Vacuum leaks in the intake system
  5. Low compression in cylinder 4 due to worn piston rings or valves

Symptoms of P0304 1999 Toyota Camry

  1. Rough idle or noticeable engine vibration
  2. Loss of power or hesitation during acceleration
  3. Increased fuel consumption
  4. Engine misfires or stumbling under load
  5. Illumination of the check engine light

How to Fix P0304 1999 Toyota Camry

  1. Begin by diagnosing the specific cause of the misfire (e.g., checking spark plugs, ignition coil, fuel injector, compression).
  2. Replace the faulty spark plugs if they are worn or fouled.
  3. Test and potentially replace the ignition coil in cylinder 4 if it is faulty.
  4. Clean or replace the fuel injector if it is clogged or malfunctioning.
  5. Inspect and repair any vacuum leaks in the intake system.

Cost to Fix P0304 1999 Toyota Camry

The cost of repairing a cylinder 4 misfire in a 1999 Toyota Camry can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing spark plugs, ignition coils, or fuel injectors can range from $100 to $300 per part. Labor costs can add another $100 to $300, bringing the total repair cost to approximately $200 to $600. It is advisable to get a detailed estimate from a qualified mechanic to determine the exact cost of repairing the misfire in your vehicle.

What does this mean?

Tech Notes for P0304 1999 Toyota Camry

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"

When is the Code Detected?

Engine Cylinder 4 is Misfiring.

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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 1999 Toyota Camry Code

1. What are the common symptoms of OBDII code P0304 in a 1999 Toyota Camry?

The common symptoms of a cylinder 4 misfire detected include rough idling, engine vibration, loss of power, and potentially increased fuel consumption.

2. What are some possible causes of the P0304 code in a 1999 Toyota Camry?

Potential causes of a cylinder 4 misfire in a 1999 Toyota Camry include faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression in the cylinder.

3. How can I diagnose the cause of the cylinder 4 misfire in my 1999 Toyota Camry?

To diagnose the cause of the misfire, you can perform a visual inspection of the spark plug, ignition coil, and fuel injector for signs of damage. Additionally, using an OBDII scanner to check for specific codes and conducting a compression test can help pinpoint the issue.

4. Can driving with a cylinder 4 misfire in a 1999 Toyota Camry cause further damage?

Continuing to drive with a misfire can potentially cause damage to the catalytic converter due to unburned fuel entering the exhaust system. It is recommended to address the issue promptly to prevent further damage.

5. How can I repair a cylinder 4 misfire in my 1999 Toyota Camry?

Repairing a cylinder 4 misfire may involve replacing the faulty spark plug, ignition coil, or fuel injector. It is also important to address any underlying issues such as vacuum leaks or low compression in the cylinder.

6. Is it safe to continue driving my 1999 Toyota Camry with the P0304 code?

It is not recommended to drive a vehicle with a misfiring cylinder, as it can lead to further damage and potential safety hazards. It is best to address the issue as soon as possible.

7. Can a dirty air filter cause a cylinder 4 misfire in a 1999 Toyota Camry?

A dirty air filter can restrict airflow to the engine, affecting the air-fuel mixture and potentially leading to a misfire. It is advisable to check and replace the air filter if necessary when diagnosing a misfire issue.

8. How much does it typically cost to repair a cylinder 4 misfire in a 1999 Toyota Camry?

The cost of repairing a cylinder 4 misfire can vary depending on the specific cause of the issue and the parts/labour costs involved. It is recommended to consult with a mechanic for an accurate estimate.

9. Can a cylinder 4 misfire be caused by bad gasoline in a 1999 Toyota Camry?

Low-quality or contaminated gasoline can contribute to misfires in the engine. It is advisable to use high-quality fuel from reputable sources to prevent potential issues with engine performance.

10. Will resetting the OBDII code P0304 in my 1999 Toyota Camry make the issue go away?

Resetting the code may temporarily turn off 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 to prevent further issues.

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