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P0273 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.


This code P0273, which is used with modern vehicles’ OBD II system for the monitoring of engine performance, is a special DTC code provided by OnBoard Diagnostics II. Specifically, this P0273 is related to a fuel injection issue in your vehicle. Let’s take a look at the meaning of this code:


The OBDII code P0273 is a general OBD II code and, depending on your vehicle’s make and model, its specific meaning can vary slightly. However, P0273 reveals a problem with the fuel injection system for engine 5 of your vehicle in almost all cases. To ensure proper engine performance, a fuel injection unit plays an important role in getting the correct quantity of fuel into the combustion chamber.


Now that we understand the meaning of the P0273 code, let’s explore the common causes behind it:

  • Faulty Fuel Injector: The primary cause of P0273 is a malfunctioning fuel injector in cylinder 5. 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.
  • Fuel Delivery Issues: Inadequate fuel delivery to the cylinder, which can result from a clogged fuel line or a weak fuel pump, can lead to this code.


  • You could suffer several symptoms when the P0273 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 P0273 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 5 fuel injector will be evaluated.

Common mistakes

  • Avoid making the following typical errors when working with the P0273 code:
  • Disregarding the law: Ignoring the P0273 code and the check engine light might result in more serious engine issues and reduced fuel economy.
  • 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 this code, P0273, depends on how it is dealt with. In the long run, ignoring this may result in increases in fuel consumption, reduced engine performance, and possibly more serious engine damage. These problems may be prevented, and your vehicle can function normally if these issues are addressed at the earliest opportunity.

What repairs can fix the codeS?

repair manuals

To resolve the P0273 code, you may need to:

  • Replace the faulty fuel injector in cylinder 5.
  • 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 P0273 include:

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


In conclusion, a special problem with the fuel injection unit in cylinder 5 of your engine is indicated by the P0273 DTC code. It is an issue that may affect the performance and emissions of your car, but it can be dealt with properly through diagnosis and repair.

It may lead to more important questions down the road if we disregard the code and make quick decisions that do not contain a diagnosis. It is important to consult a qualified mechanic when you encounter the P0273 Code for your car to function properly and efficiently.

P0273 Code – What Does It Mean & How To Fix It