AutoCodes – Nissan – P0302 2011 Nissan Altima Sedan

P0302 2011 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #2. 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: P0302 2011 Nissan Altima Sedan indicates Number 2 Cylinder Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #2.
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.

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Code Popularity 5,418

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 08, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0302 2011 Nissan Altima Sedan Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring. The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module monitors the crankshaft speed and has detected that engine cylinder #2 is misfiring.

OBDII Code P0302 2011 Nissan Altima Sedan - Number 2 Cylinder Misfire Detected - AutoCodes.com — P0302 2011 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 2011 Nissan Altima Sedan?

Faulty Spark Plug #2
Clogged or faulty Fuel Injector #2
Faulty Ignition Coil #2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection
Ignition Coil #2 harness is open or shorted
Ignition Coil #2 circuit poor electrical connection
Insufficient cylinder 2 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0302 2011 Nissan Altima Sedan?

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.

What does this mean?

Code Tech Notes

The P0302 code means that cylinder #2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #2. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0302 2011 Nissan Altima Sedan 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0302 2011 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Common symptoms of code P0302, indicating a misfire in the number 2 cylinder, include rough idling, loss of power, engine vibration, and possible hesitation during acceleration.

2. What are the possible causes of a number 2 cylinder misfire in a 2011 Nissan Altima?

A: The misfire in the number 2 cylinder can be caused by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or even low compression in the cylinder.

3. How can I diagnose the specific cause of the number 2 cylinder misfire in my 2011 Nissan Altima Sedan?

A: To diagnose the exact cause of the misfire, you may need to perform tests such as checking spark plugs, inspecting ignition coils, scanning for other related trouble codes, conducting a compression test, and looking for vacuum leaks.

4. Can driving with OBDII code P0302 in a 2011 Nissan Altima Sedan cause further damage?

A: Continuing to drive with a misfire in the number 2 cylinder can potentially lead to damage to the catalytic converter and other engine components, so it is recommended to address the issue promptly.

5. How can I repair a number 2 cylinder misfire in my 2011 Nissan Altima Sedan?

A: Repairing a misfire in the number 2 cylinder may involve replacing faulty spark plugs, ignition coils, or fuel injectors, fixing vacuum leaks, addressing compression issues, and clearing the trouble code with an OBDII scanner.

6. Is it safe to clear the OBDII code P0302 in a 2011 Nissan Altima Sedan without fixing the underlying issue?

A: Clearing the trouble code without addressing the root cause of the misfire can temporarily turn off the check engine light, but the issue will likely persist and may lead to further problems down the line.

7. Can bad fuel quality or a clogged fuel filter cause OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Poor fuel quality or a clogged fuel filter can indeed contribute to a misfire in the number 2 cylinder, as they can affect the fuel delivery and combustion process in the engine.

8. How often should I replace spark plugs in a 2011 Nissan Altima Sedan to prevent OBDII code P0302?

A: It is generally recommended to replace spark plugs every 30,000 to 50,000 miles in a 2011 Nissan Altima Sedan to maintain optimal engine performance and prevent misfires like code P0302.

9. Are there any preventive maintenance tips to avoid encountering OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Regularly servicing your vehicle, including changing spark plugs, inspecting ignition components, using high-quality fuel, and addressing any engine performance issues promptly, can help prevent misfires like code P0302.