P0303 Nissan Sentra
Cylinder 3 Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0303?
Misfire detected in cylinder 3. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Nissan Sentra triggers code P0303 (cylinder 3 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Sentra.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Nissan Sentra.
Common Causes on Nissan Sentra
- Worn spark plug on cylinder 3
- Failed ignition coil on cylinder 3
- Fuel injector issue on cylinder 3
- Intake valve carbon deposit on cylinder 3
- Low compression on cylinder 3
Symptoms
- Check Engine Light flashing during misfire
- Rough idle
- Power loss under load
- Vibration at idle
- Poor acceleration
Notes for Nissan Sentra
Swap the coil to another cylinder; if the misfire moves, the coil is confirmed bad.