P2279 Honda Code (Meaning, Causes & Fixing) of 2024

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When your Honda vehicle’s check engine light illuminates, it can be a cause for concern. One of the potential culprits could be the P2279 Honda code.

In this article, we’ll delve into what the P2279 code signifies, its symptoms, diagnostic steps, and how to effectively resolve it.

p2279 honda

Introduction to the p2279 Honda code

The P2279 code is specific to Honda vehicles and is related to the intake air system.

It indicates that there is a leak in the intake air system, particularly between the throttle body and the intake valves.

Understanding what the P2279 code means

The P2279 code is a diagnostic trouble code (DTC) that is specific to Honda vehicles. It relates to the intake air system and indicates a problem with the air-fuel mixture.

Specifically, the P2279 code signifies that the Engine Control Module (ECM) has detected a vacuum leak in the intake system.

Definition of the P2279 code

When the ECM detects that the air-fuel ratio is excessively lean due to a vacuum leak between the throttle body and the intake valves, it triggers the P2279 code.

This means that there is an imbalance in the amount of air entering the engine compared to the amount of fuel being injected, leading to a lean condition.

Common causes of the P2279 code

Several factors can contribute to the activation of the P2279 code, including:

  • Damaged or loose intake manifold gaskets
  • Cracked or disconnected vacuum hoses
  • Faulty oxygen sensor
  • Malfunctioning mass airflow sensor (MAF)
  • Issues with the throttle body or its components

Symptoms of a P2279 code

When your Honda vehicle experiences the P2279 code, you may notice the following symptoms:

Engine performance issues

The engine may exhibit poor acceleration, hesitation, or stalling due to the imbalance in the air-fuel mixture caused by the vacuum leak.

Check Engine Light (CEL) activation

The most obvious indication of a P2279 code is the illumination of the check engine light on the vehicle’s dashboard.

The diagnostic process for the P2279 code

To pinpoint the cause of the P2279 code, a systematic diagnostic approach is necessary:

Using an OBD-II scanner

Begin by connecting an OBD-II scanner to retrieve the specific trouble code and gather additional data from the vehicle’s ECM.

Inspecting for vacuum leaks

Carefully inspect the intake manifold, vacuum hoses, and connections for any signs of damage, cracks, or disconnection that could be causing the vacuum leak.

Checking the oxygen sensor

Test the oxygen sensor to ensure it is functioning correctly and providing accurate readings to the ECM.

Repairing the P2279 code

Once the root cause has been identified, appropriate repairs can be undertaken:

Addressing vacuum leaks

Repair or replace any damaged or disconnected components in the intake air system, such as intake manifold gaskets or vacuum hoses.

Replacing faulty oxygen sensor

If the oxygen sensor is determined to be faulty, replace it with a new, compatible unit to restore proper air-fuel ratio monitoring.

Preventive measures to avoid the P2279 code

To minimize the likelihood of encountering the P2279 code in the future, consider the following preventive measures:

  • Perform regular maintenance checks, including inspection of the intake system components.
  • Address any detected issues promptly to prevent them from escalating and triggering the P2279 code.

People also ask

How do I fix code P2279?

Inspect for vacuum leaks: Check intake manifold gaskets and vacuum hoses for damage. Replace any faulty components.
Verify throttle body: Ensure the throttle body and its components are functioning properly and securely seated.
Check oxygen sensor: If necessary, replace a faulty oxygen sensor located on the exhaust manifold or pipe.
Clear the code: Once repairs are made, use an OBD-II scanner to clear the P2279 code from the ECM’s memory.

How do you fix a leaking intake air system?

Inspect for leaks: Check intake manifold gaskets and vacuum hoses for cracks, damage, or disconnections.
Replace damaged components: Replace any faulty gaskets or hoses to ensure a proper seal.
Secure connections: Ensure all connections are tight and secure to prevent further leaks.

What causes a air intake leak?

Damaged gaskets: Intake manifold gaskets can degrade over time, leading to leaks.
Cracked or disconnected hoses: Vacuum hoses can develop cracks or become disconnected, allowing air to escape.
Loose connections: Improperly secured connections between components can result in leaks.
Faulty throttle body: Issues with the throttle body or its components can lead to air leaks.
Worn seals: Seals around intake components may deteriorate, causing leaks to occur.

What does intake air system leak mean?

An intake air system leak refers to a situation where there is an unintended opening or gap in the intake system of a vehicle.

This allows air to enter or escape from the system without being properly measured or controlled.

As a result, the engine may receive an incorrect air-fuel mixture, leading to poor performance, decreased fuel efficiency, and potential damage to engine components.


In conclusion, the Honda P2279 code indicates a vacuum leak in the intake air system, leading to an imbalance in the air-fuel mixture and potential engine performance issues.

By understanding the causes, symptoms, and diagnostic process outlined in this article, you can effectively address and resolve the P2279 code when it arises in your Honda vehicle.

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