P0304 2006 Ford Fusion Code - Cylinder 4 Misfire Detected
Quick Answer
Misfire is defined as a lack of combustion in a cylinder due to the absence of a spark, incorrect fuel metering, low compression, or any other cause. 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 2006 Ford Fusion 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.
Code P0304 2006 Ford Fusion Description
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
The Malfunction Indicator Lamp (MIL) blinks once per second when detecting a misfire severe enough to cause catalyst damage. If the MIL is in a steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
This Diagnostic Trouble Code (DTC) sets when the misfire detection monitor detects an engine misfire in cylinder 4.
What are the Possible Causes of the DTC P0304 2006 Ford Fusion?
- 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 2006 Ford Fusion?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0304 2006 Ford Fusion 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.
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Frequently Asked Questions about P0304 2006 Ford Fusion Code
1. What does the OBDII code P0304 mean on a 2006 Ford Fusion?
P0304 indicates that the engine's computer has detected a misfire in cylinder 4.
2. What are the common symptoms of a P0304 code?
Symptoms include rough idling, reduced engine performance, poor fuel economy, and the check engine light turning on.
3. What causes a cylinder 4 misfire in a 2006 Ford Fusion?
Common causes include a faulty spark plug, a bad ignition coil, fuel injector issues, or engine mechanical problems like low compression.
4. Can I drive my 2006 Ford Fusion with a P0304 code?
Driving with a misfire is not recommended as it can cause further engine damage and increase emissions.
5. How do I diagnose a P0304 code on a 2006 Ford Fusion?
Start by inspecting the spark plug and ignition coil for cylinder 4. Check for fuel injector issues, vacuum leaks, or perform a compression test if needed.
6. How can I fix the P0304 code in a 2006 Ford Fusion?
Replace the faulty spark plug, ignition coil, or fuel injector causing the misfire. Address any mechanical issues if found during diagnostics.
7. How much does it cost to fix a P0304 code on a 2006 Ford Fusion?
Repairs can cost $100-$300 for common issues like spark plug or ignition coil replacements, but costs may rise for more extensive repairs.
8. Can a bad fuel injector cause the P0304 code?
Yes, a clogged or malfunctioning fuel injector can lead to a misfire in cylinder 4.
9. Will replacing all spark plugs fix the P0304 code?
Replacing all spark plugs can help, but you should specifically inspect and address cylinder 4 to ensure the issue is resolved.
10. Can a vacuum leak trigger the P0304 code?
Yes, a vacuum leak near cylinder 4 can cause a lean condition, leading to a misfire and triggering the code.
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