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P0271 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 P0271 DTC code is a specific code within the On-Board Diagnostics II (OBD-II) system, which is used in modern vehicles to monitor the engine’s performance. In particular, P0271 relates to a problem with one of your vehicle’s fuel injectors.


P0271 is an OBDII code, and its unique meaning may vary slightly from vehicle to vehicle based on the make and model of your car. However, P0271 shows an issue with the fuel injection unit for cylinder four of your engine in nearly all cases. To achieve optimum engine performance, the fuel injector plays an important role by delivering the correct amount of fuel into the combustion chamber.


Let’s investigate the typical causes of the P0271 code now that we are aware of what it means:

  • Faulty Fuel Injector: The primary cause of P0271 is a malfunctioning fuel injector in cylinder 4. 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 P0271 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 P0271 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 4 fuel injector will be evaluated.

Common mistakes

When dealing with the P0271 code, avoid these common mistakes:

  • Ignoring the Code: Ignoring the check engine light and the P0271 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 severity of the P0271 code is dependent on how you deal with it. If left untreated, it can cause higher fuel consumption, lower engine performance, and more serious engine damage over time. These problems can be avoided and the vehicle will run efficiently if you deal with them immediately.

What repairs can fix the codeS?

repair manuals

To resolve the P0271 code, you may need to:

  • Replace the faulty fuel injector in cylinder 4.
  • 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 P0271 include:

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


Finally, the P0271 DTC code for cylinder 4 of your engine indicates that there is a problem with the fuel injection system. It may have an impact on the vehicle’s performance and emissions, but it is a problem that can be correctly diagnosed and corrected.

Failure to follow the code, and making hasty decisions without a diagnosis could result in more serious problems down the road. To ensure the smooth operation of your vehicle, it is recommended that you contact an expert automotive technician if you obtain a P0271 code.

P0271 Code – What Does It Mean & How To Fix It