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P0059 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 P0059 DTC code is for the failure of the heated oxygen sensor (HO2S bank 2, sensor 1 of the heater control circuit. This is common in OBDII vehicles, which are fitted with a system that checks the performance of different components, such as oxygen sensors.


A P0059 code indicates the electrical fault of a heat exchanger circuit in an oxygen sensor, Bank 2, Sensor 1, is occurring. The heater circuit shall be responsible for bringing the sensor to operating temperature within a short period of time, which allows accurate monitoring of oxygen levels in exhaust gases.


There are several potential causes for the P0059 DTC code, including:

  • Faulty oxygen sensor: The oxygen sensor itself may be defective, resulting in a malfunction in the heater circuit.
  • Wiring issues: Damaged, loose, or corroded wiring and connectors can disrupt the electrical flow to the oxygen sensor.
  • Short or open circuit: Any short or open circuit within the heater circuit can prevent the oxygen sensor from receiving the necessary power.
  • Blown fuse: A blown fuse related to the oxygen sensor or its heater circuit can trigger the P0059 code.


Common symptoms associated with the P0059 DTC code may include:

  • Illuminated check engine light (MIL)
  • Decreased fuel efficiency
  • Rough idling or engine stalling
  • Engine misfires
  • Increased exhaust emissions


The following actions will normally be taken by a skilled mechanic in order to effectively diagnose the P0059 code:

  • Scan the onboard computer system of the car to find the particular fault code(s).
  • Inspect bank 2, sensor 1, oxygen sensor’s wiring, and connections.
  • Check the continuity and appropriate resistance of the heater circuit for the oxygen sensor.
  • Inspect the oxygen sensor’s heating circuit for any blown fuses.

Common mistakes

It’s critical to avoid the following typical errors when dealing with the P0059 DTC code:

  • Failing to resolve any concurrently existing linked codes or problems.
  • Replacing the oxygen sensor before a thorough test has determined that it is defective.
  • Ignoring wiring and connection issues, which are frequently the underlying issue.

How serious is this?

While the P0059 code is not capable of producing an immediate catastrophic failure, it should be kept in mind. If the issue is ignored, it can result in a decrease in fuel efficiency, engine failure problems, and possible damage to other components over time. The Code should be addressed as soon as possible so that there are no more complications.

What repairs can fix the code?

repair manuals

Potential fixes for the P0059 DTC code might involve: – Replacing a malfunctioning oxygen sensor (bank 2, sensor 1) if testing reveals it to be ineffective.

– Replacing or repairing faulty connections and wiring.

– Replacing any blown fuses connected to the heater circuit or oxygen sensor’s heater circuit.

Related codes

Other related codes that may be encountered alongside or instead of P0059 include:

  • P0050: Heated Oxygen Sensor Heater Circuit Bank 2 Sensor 1
  • P0051: Heated Oxygen Sensor Heater Circuit Low Voltage Bank 2 Sensor 1
  • P0052: Heated Oxygen Sensor Heater Circuit High Voltage Bank 2 Sensor 1


The P0059 DTC code indicates that there is a problem with the heated oxygen sensor (HO2S bank 2, sensor 1 heater circuit. You will be able to deal effectively with this problem when you understand its significance, cause, symptoms, diagnostic procedures, occurrence of errors, severity, possible repairs, and associated codes. Remember, to make sure the P0059 DTC code is properly diagnosed and resolved, consult with an expert mechanic if you are unsure or need assistance.

P0059 Code – What Does It Mean & How To Fix It