P0304 2011 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 2011 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 2011 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 2011 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 2011 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 2011 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 2011 Ford Fusion Code
1. What are common symptoms of OBDII code P0304 (Cylinder 4 Misfire Detected) on a 2011 Ford Fusion?
- Common symptoms include rough idling, engine vibration, loss of power, and potentially increased fuel consumption.
2. What are the possible causes of a cylinder 4 misfire in a 2011 Ford Fusion triggering OBDII code P0304?
- Common causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or problems with the engine's compression.
3. How can I diagnose the cause of a cylinder 4 misfire in my 2011 Ford Fusion with OBDII code P0304?
- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum leaks, and performing a compression test to pinpoint the issue.
4. Can driving with OBDII code P0304 (Cylinder 4 Misfire Detected) on a 2011 Ford Fusion cause further damage?
- Continuing to drive with a misfire can potentially damage the catalytic converter, so it's recommended to address the issue promptly.
5. Is it safe to continue driving my 2011 Ford Fusion with a cylinder 4 misfire and OBDII code P0304?
- It is not recommended to drive with a misfire as it can lead to further engine damage and potentially unsafe driving conditions.
6. How can I repair a cylinder 4 misfire on my 2011 Ford Fusion triggering OBDII code P0304?
- Repair options may include replacing spark plugs, ignition coils, fuel injectors, fixing vacuum leaks, or addressing compression issues.
7. Will resetting the OBDII code P0304 on my 2011 Ford Fusion make the issue go away?
- Resetting the code may temporarily clear the warning light, but the underlying issue causing the misfire will still need to be addressed.
8. How much does it typically cost to repair a cylinder 4 misfire on a 2011 Ford Fusion with OBDII code P0304?
- The cost of repair can vary depending on the specific cause of the misfire, but it may range from a few hundred to over a thousand dollars.
9. Can I fix a cylinder 4 misfire triggering OBDII code P0304 on my 2011 Ford Fusion myself?
- Depending on your mechanical skills, you may be able to address some causes like changing spark plugs, but complex issues may require professional help.
10. How often should I perform maintenance to prevent cylinder misfires like OBDII code P0304 on my 2011 Ford Fusion?
- Regular maintenance, such as changing spark plugs, checking ignition components, and monitoring the engine's health, can help prevent misfires and related issues.
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