1. Home
  2. /
  3. Complete List of OBD2...
  4. /
  5. P0242 Code – What...

P0242 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.


Let us first define what the P0242 DTC code means when it comes to vehicle diagnostics. The DTCs, also known as indicators for specific problems in your vehicle’s systems, are numerical codes. P0242, in particular, pertains to a problem in the Turbocharger Boost Sensor B Circuit High.


The Turbocharger Boost Sensor B Circuit’s signal is greater than predicted, according to P0242, a DTC code that denotes a problem with the circuit. This sensor is essential for tracking and controlling the air pressure entering the engine’s intake manifold. Performance concerns and reduced fuel economy might result from the signal being stronger than planned.


Effective diagnosis and repair of the P0242 DTC code depend on an understanding of its possible causes. Typical reasons include:

  • Faulty Turbocharger Boost Sensor: A malfunctioning sensor, often due to wear and tear or electrical issues, can trigger this code by producing an excessively high signal.
  • Wiring or Connector Problems: Damaged wiring or connections in the Turbocharger Boost Sensor B Circuit may prevent the sensor from performing as intended and result in falsely high indications.
  • Vacuum Leaks: Any leaks in the vacuum lines leading to the sensor can affect its accuracy, leading to high signal readings.
  • Turbocharger Issues: By altering sensor readings, issues with the turbocharger itself, such as boost leaks or wastegate failures, can indirectly cause the P0242 code.


Recognizing symptoms related to the P0242 DTC code can help you identify the issue. Common symptoms include:

  • Reduced engine power
  • Poor acceleration
  • Increased fuel consumption
  • Illuminated check engine light
  • Potential engine knocking or pinging noises


A methodical diagnostic procedure is required to identify the precise reason for the P0242 DTC code. Typically, this entails:

  • Code Scanning: Retrieve the code and look for similar codes by using an OBD-II scanner.
  • Visual Inspection:  Check for obvious damage to the Turbocharger Boost Sensor and associated connections.
  • Examining: To find problems, examine the vacuum lines and electrical circuit of the sensor.
  • Turbocharger Inspection: If necessary, check the turbocharger for issues that might influence the sensor in a side-effect manner.

Common mistakes

Steering clear of common mistakes in the diagnostic and repair processes is crucial:

  • Neglecting the visual inspection: Skipping the visual inspection can lead to overlooking obvious issues.
  • Replacing Parts Unnecessarily: Removing the sensor prematurely without thorough testing may not always be the solution.
  • Ignoring Related Codes: Look for any Related Codes and address them, as they can contain important hints.

How serious is this?

The seriousness of the P0242 DTC code depends on how it’s addressed. It may lead to reduced engine performance, increased fuel consumption, and potentially damaged engines in the long term if ignored. The issue must be dealt with as soon as possible so that it does not lead to additional complications.

What repairs can fix the codeS?

repair manuals

Once the issue has been diagnosed, appropriate repairs can be carried out. Depending on the cause, these repairs may include:

  • Replacing the Turbocharger Boost Sensor
  • Repairing or replacing damaged wiring or connectors
  • Fixing vacuum leaks
  • Addressing turbocharger-related problems

Related codes

In some cases, the P0242 DTC code may be accompanied by related codes, such as:

  • P0240: Turbocharger Boost Sensor B Circuit Range/Performance
  • P0239: Turbocharger Boost Sensor A Circuit Range/Performance
  • P0241: Turbocharger Boost Sensor B Circuit Low

These related codes may provide additional information about the issue.


To conclude, the P0242 DTC code signifies issues within the Turbocharger Boost Sensor B Circuit, specifically indicating a high signal. Understanding its meaning, causes, symptoms, and diagnostic process is crucial for effective resolution.

If you encounter this code, address it promptly to maintain your vehicle’s optimal performance and prevent further damage. Always consider professional assistance if you are unsure about diagnosing or repairing the issue yourself.

P0242 Code – What Does It Mean & How To Fix It