AutoCodes – Infiniti – P0302 2003 Infiniti G35

P0302 2003 Infiniti G35 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 2003 Infiniti G35 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 9,164

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 Mar 29, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0302 2003 Infiniti G35 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 2003 Infiniti G35 - Number 2 Cylinder Misfire Detected - AutoCodes.com — P0302 2003 Infiniti G35 Code - Number 2 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 2003 Infiniti G35?

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 2003 Infiniti G35?

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 2003 Infiniti G35 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 2003 Infiniti G35 Code

1. What does OBDII code P0302 mean on a 2003 Infiniti G35?

P0302 indicates that the engine control module (ECM) has detected a misfire specifically in cylinder number 2.

2. What are the symptoms of a P0302 code in a 2003 Infiniti G35?

Common symptoms include rough idling, engine hesitation, reduced power, poor fuel economy, and a flashing or steady check engine light.

3. What causes a P0302 code on a 2003 Infiniti G35?

Possible causes include a faulty spark plug, a bad ignition coil, fuel injector issues, vacuum leaks, low compression in cylinder 2, or problems with the ECM.

4. Can I drive my 2003 Infiniti G35 with a P0302 code?

Itâ€™s not recommended to drive with a P0302 code, as prolonged misfires can cause engine damage, overheating of the catalytic converter, and reduced performance.

5. How do I fix a P0302 code on my 2003 Infiniti G35?

Start by inspecting and replacing the spark plug and ignition coil for cylinder 2 if necessary. If the issue persists, check the fuel injector, cylinder compression, and for any vacuum leaks.

6. How can I identify cylinder number 2 on a 2003 Infiniti G35?

In the V6 engine of the G35, cylinder 2 is located on the passenger side of the engine, second cylinder from the front.

7. Can a dirty air filter cause a P0302 code on a 2003 Infiniti G35?

While unlikely, a severely clogged air filter can affect overall engine performance and contribute to misfires indirectly. Itâ€™s worth inspecting the air filter as part of routine maintenance.

8. Will a bad fuel injector cause a P0302 code in my 2003 Infiniti G35?

Yes, a clogged or malfunctioning fuel injector in cylinder 2 can disrupt the air-fuel mixture and lead to a misfire.

9. How much does it cost to repair a P0302 code on a 2003 Infiniti G35?

The cost depends on the root cause. Replacing a spark plug or ignition coil may cost $100-$300, while fuel injector or compression-related repairs can be more expensive.

10. Can a P0302 code be caused by bad fuel?

Yes, contaminated or low-quality fuel can cause misfires, including in cylinder 2, so itâ€™s worth considering if you recently filled up with questionable fuel.