P0303 on NISSAN SENTRA — Cylinder 3 Misfire Detected

Q: "What does P0303 mean on a NISSAN SENTRA?"

"P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 3 NISSAN SENTRA owners have reported this to NHTSA."

Q: "What are the most common causes of P0303 on NISSAN SENTRA?"

"Based on 3 NHTSA reports, the most commonly cited components are: Engine, Power Train,Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0303 serious on my NISSAN SENTRA?"

"Of 3 NHTSA reports for this code on NISSAN SENTRA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my NISSAN SENTRA shows P0303?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0303 Means on Your NISSAN SENTRA

P0303 is a diagnostic trouble code indicating: Cylinder 3 Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 NISSAN SENTRA owners have reported this issue to NHTSA across model years 2005-2012. Most reports come from the 2005, 2012 model years. The most commonly reported component is Engine (66.7% of reports).

Real NISSAN SENTRA Owner Reports

Source: NHTSA Complaints Database

"I am the first owner of nissan sentra 1.8s 2005. at mileage 74,900, the check engine light turned on and a nissan dealership retrieved the code p0303 cylinder 3 misfiring on september 1, 2012. i also noticed, the coolant started to drop."

— 2005 NISSAN SENTRA owner · POWER TRAIN,ENGINE · Filed 09/01/2012

"The head gasket failed prematurely on my 2005 nissan sentra at 82,450 miles. there was issues when the vehicle would start up in the mornings or on cold starts. engine would misfire 3-5 seconds after starting. i immediately took the vehicle to my local nissan dealership."

— 2005 NISSAN SENTRA owner · ENGINE · Filed 08/22/2012

"Number 3 cylinder low compression with only 83k miles on the vehicle. rough engine driving and check engine light on. codes p0300 and p0303 displayed."

— 2012 NISSAN SENTRA owner · ENGINE · Filed 09/01/2019

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'05

1

'12

Common Causes on NISSAN SENTRA

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 66.7%

POWER TRAIN,ENGINE 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0303 mean on a NISSAN SENTRA? ▾

P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 3 NISSAN SENTRA owners have reported this to NHTSA.

What are the most common causes of P0303 on NISSAN SENTRA? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Engine, Power Train,Engine. These percentages are based on the component field in owner complaints.

Is P0303 serious on my NISSAN SENTRA? ▾

Of 3 NHTSA reports for this code on NISSAN SENTRA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my NISSAN SENTRA shows P0303? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.