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Engine-Codes – Scion – P0304 2007 Scion xB

P0304 2007 Scion xB Code - Cylinder 4 Misfire Detected

Quick Answer

When the OBD-II system in a vehicle detects a misfire in cylinder 4, it triggers diagnostic trouble code P0304. 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 2007 Scion xB 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 17, 2024
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Code P0304 2007 Scion xB Description

When the OBD-II system in a vehicle detects a misfire in cylinder 4, it triggers diagnostic trouble code P0304. This code indicates that the engine's computer has detected a misfire in the fourth cylinder of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the proper time, resulting in a lack of power, rough idle, and potential damage to the engine over time.

OBDII Code P0304 2007 Scion xB - Cylinder 4 Misfire Detected
P0304 2007 Scion xB Code - Cylinder 4 Misfire Detected

Common Causes of P0304 2007 Scion xB

  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 manifold.
  5. Low compression in cylinder 4.

Symptoms of P0304 2007 Scion xB

  1. Rough idle or vibrations while the engine is running.
  2. Loss of power or acceleration.
  3. Engine misfires or hesitation during acceleration.
  4. Increased fuel consumption.
  5. Illumination of the check engine light on the dashboard.

How to Fix P0304 2007 Scion xB

  1. Begin by diagnosing the specific cause of the misfire in cylinder 4 using a scan tool to identify the underlying issue.
  2. Inspect and replace the spark plugs in cylinder 4 if they are worn or fouled.
  3. Test the ignition coil in cylinder 4 and replace it if faulty.
  4. Check the fuel injector in cylinder 4 for clogs or malfunctions and clean or replace as necessary.
  5. Inspect the intake manifold for vacuum leaks and repair any leaks found.

Cost to Fix P0304 2007 Scion xB

The cost of repairing a cylinder 4 misfire in a 2007 Scion xB can vary depending on the specific cause of the issue. On average, the cost of replacing spark plugs, ignition coils, and fuel injectors can range from $100 to $500, including parts and labor. Additional costs may apply if there are other underlying issues contributing to the misfire. It's recommended to consult with a qualified mechanic for a more accurate cost estimate based on the specific diagnosis and repair needed. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and shop rates.

What does this mean?

Tech Notes for P0304 2007 Scion xB

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 2007 Scion xB Code

1. What are the common symptoms of OBDII code P0304 in a 2007 Scion xB?

A: Common symptoms of P0304 (Cylinder 4 Misfire Detected) in a 2007 Scion xB may include rough idling, loss of power, engine misfiring, and a noticeable decrease in fuel efficiency.

2. What are some possible causes of OBDII code P0304 in a 2007 Scion xB?

A: Possible causes of P0304 in a 2007 Scion xB include faulty spark plugs, a malfunctioning ignition coil, low fuel pressure, a vacuum leak, or a problem with the fuel injector for cylinder 4.

3. How can I diagnose the cause of OBDII code P0304 in my 2007 Scion xB?

A: To diagnose the cause of P0304 in a 2007 Scion xB, you can start by checking the spark plugs, ignition coil, fuel injector, and fuel pressure. Additionally, performing a compression test on cylinder 4 can help identify any internal engine issues.

4. Can driving with OBDII code P0304 in a 2007 Scion xB cause further damage?

A: Continuing to drive with P0304 in a 2007 Scion xB can potentially cause damage to the catalytic converter, oxygen sensor, and other engine components due to unburned fuel entering the exhaust system.

5. How can I repair OBDII code P0304 in my 2007 Scion xB?

A: Repairing P0304 in a 2007 Scion xB typically involves replacing the spark plugs, ignition coil, fuel injector, or addressing any other underlying issues causing the misfire in cylinder 4.

6. Is it safe to continue driving my 2007 Scion xB with OBDII code P0304?

A: It is not recommended to drive your 2007 Scion xB with P0304 (Cylinder 4 Misfire Detected) as it can lead to further damage and potentially unsafe driving conditions. It is best to address the issue promptly.

7. How much does it typically cost to repair OBDII code P0304 in a 2007 Scion xB?

A: The cost to repair P0304 in a 2007 Scion xB can vary depending on the exact cause of the misfire and the cost of parts and labor. Repairs may range from a few hundred dollars to over a thousand dollars.

8. Can bad fuel quality cause OBDII code P0304 in a 2007 Scion xB?

A: Poor quality fuel with contaminants or a lower octane rating than recommended can potentially contribute to misfires and trigger OBDII code P0304 in a 2007 Scion xB.

9. Will resetting the OBDII code P0304 in my 2007 Scion xB make the issue go away?

A: Resetting the OBDII code P0304 in a 2007 Scion xB may temporarily turn off the check engine light, but it will not fix the underlying issue causing the cylinder 4 misfire. The problem should be properly diagnosed and repaired.

10. How often should I replace spark plugs in my 2007 Scion xB to prevent OBDII code P0304?

A: It is recommended to replace spark plugs in a 2007 Scion xB according to the manufacturer's recommended maintenance schedule, typically every 30,000 to 100,000 miles depending on the type of spark plugs used. Regular maintenance can help prevent issues like OBDII code P0304.

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