AutoCodes – Dodge – P2279 Dodge

P2279 Dodge Code - O2 Sens Signal Stuck Lean Bank1 Sens3

Quick Answer

The Engine Control Module (ECM) has detected a vacuum leak into the engine. Common causes include Check for intake leaks, Faulty Mass Air Flow (MAF) sensor, Faulty PCV system. 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: P2279 Dodge indicates O2 Sens Signal Stuck Lean Bank1 Sens3.
Common causes: Common causes include Check for intake leaks, Faulty Mass Air Flow (MAF) sensor, Faulty PCV system.
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 3,709

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2279 Dodge Description

The Engine Control Module (ECM) has detected a vacuum leak into the engine. The ECM monitors the air passing through the Mass Air Flow (MAF) sensor, a vacuum leak means that unmetered air is entering the engine without passing through the MAF.

OBDII Code P2279 Dodge - O2 Sens Signal Stuck Lean Bank1 Sens3 - AutoCodes.com — P2279 Dodge Code - O2 Sens Signal Stuck Lean Bank1 Sens3

What does this mean?

What are the Possible Causes of the DTC P2279 Dodge?

Check for intake leaks
Faulty Mass Air Flow (MAF) sensor
Faulty PCV system

How to Fix the DTC P2279 Dodge?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2279 Dodge 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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Need Help with the Code?

Get the P2279 Dodge code diagnosed by a professional: Find a repair shop in your area

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 P2279 Dodge Code

What does the OBDII code P2279 mean for Dodge vehicles?

Code P2279 indicates that the oxygen sensor signal for Bank 1, Sensor 3 is stuck in a lean condition, where the air-fuel mixture has too much air compared to fuel.

What are the common symptoms of a P2279 code in a Dodge?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, difficulty starting, and the check engine light being illuminated.

What causes the O2 sensor signal to get stuck lean for Bank 1, Sensor 3?

Common causes include a faulty oxygen sensor, exhaust leaks, intake air leaks, clogged fuel injectors, or incorrect air-fuel ratio from other engine issues.

How can I diagnose the P2279 code on my Dodge?

Use an OBDII scanner to confirm the code, inspect the oxygen sensor and wiring, check for intake and exhaust leaks, and test fuel system components like injectors and the fuel pump.

Can a faulty oxygen sensor be the sole cause of a P2279 code?

Yes, a faulty oxygen sensor can cause the signal to be stuck lean, but other issues like air leaks or fuel system problems should also be considered.

How do I fix the P2279 code on a Dodge vehicle?

Repairs may include replacing the oxygen sensor, fixing intake or exhaust leaks, cleaning or replacing fuel injectors, and ensuring proper air-fuel ratio calibration.

Is it safe to drive with a P2279 code on my Dodge?

Driving with this code can lead to poor engine performance and increased emissions. It’s best to address the issue promptly to avoid potential damage.

How much does it typically cost to repair a P2279 code?

Repairs can range from $100 for an oxygen sensor replacement to $500+ if extensive diagnostics and repairs like leak fixes are required.

Can a P2279 code cause damage if left unresolved?

Yes, prolonged driving with this code can lead to engine damage, catalytic converter issues, and decreased fuel efficiency.

Do I need a professional mechanic to fix the P2279 code?

If you’re experienced with car repairs, you can attempt basic fixes like replacing the oxygen sensor. Otherwise, a professional mechanic is recommended for proper diagnostics and repairs.