P0303 2012 Ford Fusion Code - Cylinder 3 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 #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3. 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
- P0303 2012 Ford Fusion indicates Cylinder 3 Misfire Detected.
- Common causes
- Common causes include Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3.
- 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 P0303 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 3.
What are the Possible Causes of the DTC P0303 2012 Ford Fusion?
- Faulty Spark Plug #3
- Clogged or faulty Fuel Injector #3
- Faulty Ignition Coil #3
- Fuel Injector #3 harness is open or shorted
- Fuel Injector #3 circuit poor electrical connection
- Ignition Coil #3 harness is open or shorted
- Ignition Coil #3 circuit poor electrical connection
- Insufficient cylinder 3 compression
- Incorrect fuel pressure
- Intake air leak
How to Fix the DTC P0303 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 P0303 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 P0303 2012 Ford Fusion Code
1. What does the OBDII code P0303 mean on a 2012 Ford Fusion?
P0303 indicates a misfire has been detected in cylinder 3 of your 2012 Ford Fusion’s engine.
2. What are the common symptoms of code P0303 in a 2012 Ford Fusion?
Symptoms include rough idling, engine hesitation, loss of power, reduced fuel efficiency, and the Check Engine Light turning on.
3. What causes a cylinder 3 misfire in a 2012 Ford Fusion?
Common causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leaks, or low engine compression in cylinder 3.
4. Can driving with a P0303 code damage my 2012 Ford Fusion?
Yes, driving with a misfire can damage the catalytic converter and other engine components over time, so prompt repairs are recommended.
5. How do I diagnose the P0303 code on my 2012 Ford Fusion?
Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 3. You may also need to perform a compression test or check for vacuum leaks.
6. How do I fix the P0303 code in my 2012 Ford Fusion?
Repairs may include replacing the spark plug or ignition coil for cylinder 3, cleaning or replacing the fuel injector, fixing vacuum leaks, or addressing low compression.
7. Can bad fuel cause a P0303 code on my 2012 Ford Fusion?
Yes, contaminated or poor-quality fuel can cause misfires, so ensure you are using clean, high-quality fuel.
8. How much does it cost to fix a P0303 code on a 2012 Ford Fusion?
Costs vary depending on the issue, but replacing a spark plug or ignition coil typically costs $100–$200, while more extensive repairs like fixing compression issues can be more expensive.
9. Will a P0303 code cause my 2012 Ford Fusion to fail emissions testing?
Yes, a misfire can increase emissions and cause your vehicle to fail emissions testing until the issue is resolved.
10. Can I clear the P0303 code without fixing the problem?
You can clear the code with an OBDII scanner, but the issue will likely return unless the underlying problem is addressed.
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