OBD code P0303 indicates a misfire in cylinder 3 of the engine.
This fault affects the ignition system.
Symptoms include the engine light being on, lack of power, hard starting, and engine hesitation.
Common causes are a faulty spark plug, clogged fuel injector, or ignition coil in cylinder 3. This issue should be addressed promptly to prevent further damage.
A possible fix involves inspecting and repairing the wiring harness and connectors related to cylinder 3 components.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the p0303 OBD Code
The vehicle may experience a misfire in cylinder 3 indicated by fault code P0303.
- With OBD code P0303, the engine light will be ON.
- Lack/loss of power may be experienced.
- Hard start can occur.
- Engine hesitation might be noticeable.
Causes of the p0303 OBD Code
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P0303 fault code typically indicates a misfire in cylinder 3 of the engine.
- P0303 can be caused by a Faulty Spark Plug #3.
- A Clogged or faulty Fuel Injector #3.
- A 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.
- Or an Intake air leak.
Fixing Error Code p0303 Step By Step
Addressing code P0303 involves diagnosing and resolving cylinder 3 misfire issues in the engine.
- To fix OBDII code P0303, first, review the possible causes related to cylinder 3 misfire.
- Visually inspect the ignition system components such as spark plugs, ignition coils, and spark plug wires for any signs of wear or damage.
- Check the fuel injector for proper operation and ensure it is delivering fuel to the cylinder correctly.
- Test the compression in cylinder 3 to verify the engine’s mechanical condition.
- If necessary, replace faulty ignition components, fuel injector, or perform a cylinder head repair.
- Clear the fault code with a scan tool and test drive the vehicle to confirm the issue has been resolved.
Cost Of Fixing p0303 Fault Code
Diagnosing and repairing fault code P0303 typically involves addressing cylinder 3 misfire issues.
The cost to diagnose and fix OBD code P0303 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the repair needed.
Details of the p0303 OBD Code
Fault code P0303 indicates a misfire in cylinder 3 of the engine.
Code P0303 means a misfire was detected in cylinder 3. It’s triggered by the Engine Control Module (ECM) based on crankshaft speed fluctuations.
This code indicates that cylinder 3 is not contributing properly to the engine’s combustion cycle, leading to a rough running engine and potential power loss.
Misfires can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or low compression in the cylinder.
The ECM monitors the crankshaft speed to detect variations caused by the misfire in cylinder 3.
Mechanic’s Tech Notes
Code P0303 indicates a misfire in cylinder 3, potentially caused by ignition system faults or fuel delivery issues.
To diagnose and fix OBDII code P0303, which indicates a misfire in cylinder 3, start by checking the spark plug, ignition coil, and fuel injector for that cylinder.
Use a voltmeter to test the ignition coil’s primary and secondary circuits for proper resistance values.
Inspect the spark plug for fouling or wear.
Swap components with another cylinder to see if the misfire moves.
Additionally, perform a compression test on cylinder 3 to check for internal engine issues.
Clear the code after repairs and monitor for recurrence.
FAQ
Common causes of OBD code P0303: Faulty Spark Plug #3, Clogged Fuel Injector #3, Faulty Ignition Coil #3, Poor electrical connections, Insufficient cylinder 3 compression.
Diagnose P0303 misfire by checking spark plug, fuel injector, ignition coil #3. Inspect wiring for damage or poor connection. Fix as needed.
It is not safe to continue driving with OBD code P0303. Address the causes like faulty spark plug #3, clogged fuel injector #3, or ignition coil #3 immediately.
Wrap Up
If your check engine light is on and your engine is running rough, you may have OBDII code P0303, indicating a misfire in cylinder 3. This could be caused by a faulty spark plug, ignition coil, fuel injector, or low compression in that cylinder.
To address OBDII code P0303, start by checking the spark plug, ignition coil, and fuel injector for cylinder 3. Inspect the wiring harness and connectors for any damage or corrosion that could be affecting the components’ performance.
Consider performing a compression test on cylinder 3 to rule out any internal
