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P0279 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The P0279 DTC code, used in modern vehicles to track the performance of their engines, is a special code within OBD II onboard diagnostics which is designed for monitoring engine performance. Specifically, P0279 is related to a problem in one of the fuel injection systems on your vehicle. Let’s take a look at the meaning of this code:


P0279 is OBD II’s general code, but depending on the make and model of your vehicle it may have slightly different meanings. But P0279 indicates that there is a problem with the fuel pump on Cylinder 7 of your engine in most cases. For the engine to be efficient, the fuel injector plays an essential role by supplying the right amount of fuel into the combustion chamber.


Now that we are aware of what the P0279 code means, let’s investigate some of its typical causes:

  • Faulty Fuel Injector: The primary cause of P0279 is a malfunctioning fuel injector in cylinder 7. This can result from wear and tear, clogging, or electrical issues.
  • Wiring or Connector Problems: Damaged or corroded wiring or connectors associated with the fuel injector can trigger the code.
  • Issues with fuel delivery: This code can indicate inadequate fuel delivery to the cylinder, which may be caused by a blocked fuel line or a shoddy fuel pump.


  • You could suffer several symptoms when the P0279 code is activated, including:
  • Check Engine Light: The check engine light on your dashboard turning on is the most typical sign.
  • Reduced Engine Performance: The effectiveness and power of your engine may start to decline.
  • Rough Idling: When the engine is idling, it may run unevenly or vibrate.
  • Increased Emissions: Due to faulty combustion, the vehicle may produce additional pollutants.


Diagnosing the P0279 code typically involves the following steps:

  • OBD-II Scanner: A mechanic will use an OBD-II scanner to retrieve the code and gather information about the issue.
  • Visual Inspection: The fuel injector, wiring, and connections will all be visually inspected to look for any evident issues.
  • Testing the Injector: The performance and resistance of the cylinder 7 fuel injector will be evaluated.

Common mistakes

When dealing with the P0279 code, avoid these common mistakes:

  • Ignoring the Code: Ignoring the check engine light and the P0279 code can lead to more severe engine problems and decreased fuel efficiency.
  • Replacing Parts Without Diagnosis: Avoid replacing the fuel injector or related components without proper diagnosis, as this can be costly and ineffective.

How serious is this?

The seriousness of the P0279 code is dependent upon what measures are taken to address it. If we ignore it, there could be an increase in fuel consumption, reduced performance of the engines, and a possible higher level of damage to them over time. Preventing these problems and keeping your car in good working order can be ensured by dealing with them immediately.

What repairs can fix the codeS?

repair manuals

To resolve the P0279 code, you may need to:

  • Replace the faulty fuel injector in cylinder 7.
  • Repair or replace damaged wiring or connectors.
  • Address any fuel delivery issues, such as a clogged fuel line or a weak fuel pump.

Related codes

Other related codes that may appear alongside P0279 include:

  • P0267: Cylinder 3 Injector Circuit Low
  • P0268: Cylinder 3 Injector Circuit High
  • P0269: Cylinder 3 Contribution/Balance Fault


In conclusion, a specific fuel injector problem in cylinder 7 of your engine has been identified by the P0279 DTC code. While this may hurt your vehicle’s performance and emissions, it can also be addressed by a correct diagnosis and repair. A more important problem may arise if a Code is ignored or hurried decisions are made without diagnosis.

To ensure your vehicle runs smoothly and efficiently, it is advisable to consult a qualified mechanic if you come into contact with the P0279 code.

P0279 Code – What Does It Mean & How To Fix It