P0304 2012 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 2012 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 2012 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 2012 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 2012 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 2012 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 2012 Ford Fusion Code
1. What does OBDII code P0304 on a 2012 Ford Fusion indicate?
OBDII code P0304 for a 2012 Ford Fusion signifies a Cylinder 4 Misfire Detected.
2. What are the common symptoms of a cylinder 4 misfire in a Ford Fusion?
Common symptoms include rough idling, engine hesitation, loss of power, increased fuel consumption, and potential engine vibrations.
3. What are the possible causes of a cylinder 4 misfire in a 2012 Ford Fusion?
Potential causes may include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine's computer system.
4. How can I diagnose the cause of a cylinder 4 misfire in my Ford Fusion?
Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum hoses, compression levels, and using a scan tool to monitor real-time data.
5. Can driving with a cylinder 4 misfire damage my Ford Fusion's engine?
Yes, driving with a misfire can potentially cause damage to the catalytic converter, oxygen sensors, and other engine components if left unresolved for an extended period.
6. What are some DIY repair tips for resolving a cylinder 4 misfire in a 2012 Ford Fusion?
DIY repair tips include replacing spark plugs, swapping ignition coils, cleaning or replacing fuel injectors, checking for vacuum leaks, and ensuring proper engine maintenance.
7. Should I reset the OBDII code after fixing the cylinder 4 misfire issue in my Ford Fusion?
Yes, it's recommended to clear the code using an OBDII scanner after fixing the problem to see if the issue has been successfully resolved.
8. How much does it typically cost to repair a cylinder 4 misfire in a 2012 Ford Fusion at a professional mechanic?
The cost can vary depending on the exact cause of the misfire, but it may range from $100 to $500 or more, including parts and labor.
9. Is it safe to continue driving my Ford Fusion with a cylinder 4 misfire if the issue seems intermittent?
It's not recommended to drive with a misfire, even if it's intermittent, as it can lead to more severe problems and potential damage to the engine over time.
10. What steps can I take to prevent cylinder misfires in my Ford Fusion in the future?
To prevent misfires, maintain regular engine tune-ups, use quality fuel, replace spark plugs and ignition components as recommended, and address any issues promptly to avoid further damage.
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