P0303 Hyundai Code - Cylinder 3 Misfire Detected
Quick Answer
When a misfire occurs, engine speed will fluctuate. 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 Hyundai 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 Hyundai Description
What are the Possible Causes of the DTC P0303 Hyundai?
- 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 Hyundai?
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 Hyundai 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 Hyundai Code
1. What are the common symptoms of OBDII code P0303 (Cylinder 3 Misfire Detected) in a Hyundai?
- Common symptoms include rough engine idle, loss of power, hesitation or jerking during acceleration, and possible engine vibration.
2. What are the typical causes of a cylinder 3 misfire in a Hyundai triggering code P0303?
- The misfire in cylinder 3 can be caused by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression.
3. How can I diagnose the specific cause of the cylinder 3 misfire in my Hyundai?
- To diagnose the issue, you can perform tests like checking the spark plug, ignition coil, fuel injector, compression test, and scanning for other trouble codes related to the misfire.
4. What are some repair tips for resolving OBDII code P0303 in a Hyundai?
- Repair tips may include replacing the spark plugs, ignition coils, or fuel injectors, checking for vacuum leaks, performing a compression test, and ensuring proper engine timing.
5. Can driving with a misfiring cylinder 3 in a Hyundai lead to further damage?
- Continuing to drive with a misfiring cylinder can potentially cause damage to the catalytic converter, O2 sensors, and other engine components over time.
6. How important is it to address OBDII code P0303 promptly in a Hyundai?
- It is crucial to address code P0303 promptly to prevent further damage to the engine, improve fuel efficiency, and maintain optimal performance of the vehicle.
7. Are there any preventive measures to avoid encountering cylinder misfires in a Hyundai?
- Regular maintenance, such as timely spark plug replacements, using high-quality fuel, and addressing any engine performance issues promptly, can help prevent cylinder misfires.
8. Can a DIY enthusiast with basic mechanical skills fix OBDII code P0303 in a Hyundai?
- Depending on the specific cause, a DIY enthusiast with basic skills may be able to address the misfire by replacing spark plugs or ignition coils. However, some issues may require professional diagnosis and repair.
9. How long does it typically take to repair a cylinder 3 misfire triggering code P0303 in a Hyundai?
- The repair time can vary based on the cause of the misfire and the extent of the issue. Simple fixes like replacing a spark plug may take less than an hour, while more complex issues can take longer.
10. Is it advisable to reset the OBDII code P0303 in a Hyundai after addressing the misfire?
- Yes, after addressing the underlying issue causing the misfire, it is recommended to reset the trouble code using an OBDII scanner to clear the error and monitor if the problem reoccurs.
Discuss the causes and fixes for P0303 Hyundai OBDII Code
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Riding down the highway hit the gas pedal & The car conked out no oil which i replaced & gave the car a jump & it does not take the charge & start .....How do i clear p o 303
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You can clear the code by just disconnecting the car battery, but the code won't stop the engine or cause a no start problem. If you had no oil in the engine or was very low, then you could have a mechanical problem. Damage interior engine parts.
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My Hyundai Elantra 2017, 30000 misfiring and engine light.
The problem does not occur at the dealer, and received no code.
Two days later, same thing took it back, no code. They said they are unable to do anything because no code and problem not happening.
Right after I went to Auto Zone who tested and came up with a code p0303 . Took it back to dealer who said they need to replicate the problem. They said the manufacturer told them it needs a new coil. Waiting 5 days to get that.
My question is I have asked them several times about the spark plugs. They said they did not check them because the code did not appear and the manufacturer said to replace the coil.
I have not received my car yet.
Is there any reason they refuse to check the plugs? -
Because of the type of symptom, intermittent misfire, and check engine light, the spark plugs are very unlikely to be the problem. Also, since they can't consistently duplicate the problem, they have to follow the factory recommendations, otherwise they'll be open for a lemon lawsuit. For example, if they replace three parts (or they try to repair the vehicle three times), and the same problem continues, then you can ask them to buy back the vehicle back or give you a new one.
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