What P0303 means
Diagnostic Trouble Code (DTC) P0303 stands for Cylinder 3 Misfire Detected. This is a generic OBD2 diagnostic trouble code indicating that the engine computer (ECU) has registered an operational anomaly in the powertrain (p) systems.
When this error registers, the ECU records a freeze frame of sensor data and lights up the Check Engine Light on your dashboard to notify the operator of a system fault.
Symptoms of OBD2 Code P0303
When code P0303 is active, your car might exhibit the following common symptoms:
- Vibration
- Sluggish throttle response
- Flashing dashboard light
Common Causes of Code P0303
Faults that trigger this code typically include:
- Cause 1: Failed Cylinder 3 spark plug or ignition coil
- Cause 2: Fuel injector failure
- Cause 3: Compression failure
Can you drive with a P0303 code?
No. Engine shaking and damage to the exhaust system may occur.
Expected Repair Cost Band
$60 - $200.
Related Diagnostic Trouble Codes
If you have scanned multiple codes, see these related guides for troubleshooting context:
Frequently Asked Questions
Yes, if Cylinder 3's injector cannot spray fuel, no combustion occurs, triggering the misfire.