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P0162 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.


For identifying specific problems within a vehicle’s OBD system, DTC codes are alphanumeric indicators used to distinguish between the various components. P0162 is a DTC with regard to the O2 sensor circuit for Bank 2, Sensor 3, also known as an upstream O2 sensor. The sensor is of crucial importance to monitor exhaust gases’ oxygen content after it has been injected into the catalyst converter.


The P0162 code indicates that on bank 2, there is a problem with the voltage of the downstream O2 sensor. In particular, a higher output of voltage than expected is detected. There may be several factors contributing to this discrepancy, which affects the ability of a sensor to read accurately.


  • Defective Oxygen Sensor: One of the main root causes of the P0162 code is a deficient downstream O2 sensor. Voltage measurements can become erroneous as a result of dirty or worn-out sensors.
  • Wire or Connector Problems: The downstream O2 sensor’s wire and connections that are damaged or corroded might obstruct the signal’s transfer and impact the voltage output.
  • Leaks in the Exhaust System: Any leaks in the exhaust system close to the downstream O2 sensor may bring erroneous air into the system and affect the voltage readings of the sensor.


  • Check Engine Light Illumination: The Check Engine Light illumination on the dashboard of the car is the P0162 code’s most obvious symptom.
  • Worse Fuel Efficiency: An issue with the downstream O2 sensor might result in incorrect fuel mixture regulation and worse fuel economy.
  • Problems with engine performance: Due to inaccurate sensor readings, your engine may have less power, a rough idle, or trouble starting.


The P0162 code has to be diagnosed using a methodical process:

  • OBD-II Scanner: A skilled mechanic will access the vehicle’s Engine Control Module (ECM) with an OBD-II scanner to extract the recorded DTCs.
  • Visual Inspection: The downstream O2 sensor, its cabling, and its connections will be visually inspected by the technician for any obvious flaws or damage.
  • Sensor Testing: Under varied exhaust circumstances, the voltage output of the downstream O2 sensor may be tested using specialized diagnostic equipment.
  • Cross-checking: The technician can validate the problem by comparing the upstream O2 sensor readings and the actual sensor voltage readings to the predicted values.

Common mistakes

  • Replacing an o2 sensor without verifying the root cause in view of other factors that may be responsible for high voltage output, such as electrical disturbances or exhaust system leakages. 
  • Lack of attention to checking for related problem codes, which could lead to more information on the issue.

How serious is this?

The P0162 code should not be disregarded, as it does not pose a direct or severe problem with drivability. If a downstream O2 sensor with high voltage output gets damaged, an increase in emissions and decreased fuel efficiency could result over time, which would be of greater concern if the problem is not addressed.

What repairs can fix the code?

repair manuals

  • O2 Sensor Replacement: If the downstream O2 sensor is found to be defective or produces excessive voltage readings, the problem can be fixed by replacing it with a brand-new, high-quality sensor.
  • Repairing wire or connections: Correct signal transmission and voltage readings can be obtained by addressing any corroded or damaged wire and connections connected to the sensor.
  • Repairing Exhaust System Leaks: The voltage readings of the downstream O2 sensor can be enhanced by fixing any leaks in the exhaust system close by.

Related codes

  • P0147: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 3)
  • P0150: O2 Sensor Circuit (Bank 2, Sensor 1)


A DTC code P0162 shall be applied to a downstream O2 sensor on bank 2 indicating high voltage output. Vehicle owners and mechanics have the power to take corrective action when they understand the meaning, cause, symptoms, or possible repair of this code. The maintenance of optimal engine performance, fuel efficiency, and emission control will be facilitated by a timely diagnosis and resolution of the problem.

It is essential to seek the help of a qualified technician when you are experiencing the P0162 code or consider that your vehicle has O2 sensor-related problems, in order to make sure it operates properly and efficiently.

P0162 Code – What Does It Mean & How To Fix It